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666668888899999 = 41271523114724283
BaseRepresentation
bin1001011110010101001111001…
…0010011100100000110011111
310020102110220221010022000021121
42113211103302103210012133
51144340200341024244444
610321515243132311411
7260265144356611126
oct22745236223440637
93212426833260247
10666668888899999
1118346a7628421a7
1262930a92012567
13227cb7b655390b
14ba8ad36c62abd
1552118c385c084
hex25e54f24e419f

666668888899999 has 16 divisors (see below), whose sum is σ = 686759755497984. Its totient is φ = 646769612203200.

The previous prime is 666668888899987. The next prime is 666668888900009. The reversal of 666668888899999 is 999998888866666.

It is a cyclic number.

It is not a de Polignac number, because 666668888899999 - 221 = 666668886802847 is a prime.

666668888899999 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 666668888899892 and 666668888899901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666668883899999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51551089 + ... + 63173194.

It is an arithmetic number, because the mean of its divisors is an integer number (42922484718624).

Almost surely, 2666668888899999 is an apocalyptic number.

666668888899999 is a deficient number, since it is larger than the sum of its proper divisors (20090866597985).

666668888899999 is a wasteful number, since it uses less digits than its factorization.

666668888899999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114725118.

The product of its digits is 15045919506432, while the sum is 115.

The spelling of 666668888899999 in words is "six hundred sixty-six trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, eight hundred ninety-nine thousand, nine hundred ninety-nine".

Divisors: 1 41 271 523 11111 21443 141733 5811053 114724283 4703695603 31090280693 60000800009 1274701508413 2460032800369 16260216802439 666668888899999