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66066013520 = 2451363525013
BaseRepresentation
bin111101100001110101…
…110101110101010000
320022112020212012221122
4331201311311311100
52040300344413040
650203355541412
74526114564213
oct754165656520
9208466765848
1066066013520
11260225a6881
121097945a868
1362cb3ca0c0
1432aa36777a
151aba07a1b5
hexf61d75d50

66066013520 has 40 divisors (see below), whose sum is σ = 165419136456. Its totient is φ = 24393604608.

The previous prime is 66066013493. The next prime is 66066013567. The reversal of 66066013520 is 2531066066.

It can be written as a sum of positive squares in 4 ways, for example, as 281971264 + 65784042256 = 16792^2 + 256484^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31761467 + ... + 31763546.

Almost surely, 266066013520 is an apocalyptic number.

It is an amenable number.

66066013520 is an abundant number, since it is smaller than the sum of its proper divisors (99353122936).

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

66066013520 is a wasteful number, since it uses less digits than its factorization.

66066013520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63525039 (or 63525033 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 66066013520 its reverse (2531066066), we get a palindrome (68597079586).

The spelling of 66066013520 in words is "sixty-six billion, sixty-six million, thirteen thousand, five hundred twenty".

Divisors: 1 2 4 5 8 10 13 16 20 26 40 52 65 80 104 130 208 260 520 1040 63525013 127050026 254100052 317625065 508200104 635250130 825825169 1016400208 1270500260 1651650338 2541000520 3303300676 4129125845 5082001040 6606601352 8258251690 13213202704 16516503380 33033006760 66066013520