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66691591680 = 293571240543
BaseRepresentation
bin111110000111001000…
…001110111000000000
320101010211222212212010
4332013020032320000
52043041021413210
650345424132520
74550452114230
oct760710167000
9211124885763
1066691591680
1126313734a1a
1210b12a67140
13639abb00ac
14332948bcc0
151b04e4b920
hexf8720ee00

66691591680 has 160 divisors (see below), whose sum is σ = 243662690304. Its totient is φ = 15243780096.

The previous prime is 66691591657. The next prime is 66691591691. The reversal of 66691591680 is 8619519666.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (160).

It is a self number, because there is not a number n which added to its sum of digits gives 66691591680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566512 + ... + 674031.

Almost surely, 266691591680 is an apocalyptic number.

66691591680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66691591680 is an abundant number, since it is smaller than the sum of its proper divisors (176971098624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66691591680 is a wasteful number, since it uses less digits than its factorization.

66691591680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1240576 (or 1240560 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 57.

The spelling of 66691591680 in words is "sixty-six billion, six hundred ninety-one million, five hundred ninety-one thousand, six hundred eighty".

Divisors: 1 2 3 4 5 6 7 8 10 12 14 15 16 20 21 24 28 30 32 35 40 42 48 56 60 64 70 80 84 96 105 112 120 128 140 160 168 192 210 224 240 256 280 320 336 384 420 448 480 512 560 640 672 768 840 896 960 1120 1280 1344 1536 1680 1792 1920 2240 2560 2688 3360 3584 3840 4480 5376 6720 7680 8960 10752 13440 17920 26880 53760 1240543 2481086 3721629 4962172 6202715 7443258 8683801 9924344 12405430 14886516 17367602 18608145 19848688 24810860 26051403 29773032 34735204 37216290 39697376 43419005 49621720 52102806 59546064 69470408 74432580 79394752 86838010 99243440 104205612 119092128 130257015 138940816 148865160 158789504 173676020 198486880 208411224 238184256 260514030 277881632 297730320 317579008 347352040 396973760 416822448 476368512 521028060 555763264 595460640 635158016 694704080 793947520 833644896 952737024 1042056120 1111526528 1190921280 1389408160 1587895040 1667289792 1905474048 2084112240 2223053056 2381842560 2778816320 3175790080 3334579584 4168224480 4446106112 4763685120 5557632640 6669159168 8336448960 9527370240 11115265280 13338318336 16672897920 22230530560 33345795840 66691591680