12055991688 has 96 divisors (see below), whose sum is σ = 35739926040. Its totient is φ = 3648706560.

The previous prime is 12055991669. The next prime is 12055991699. The reversal of 12055991688 is 88619955021.

12055991688 is a `hidden beast` number, since 1 + 2 + 0 + 559 + 9 + 1 + 6 + 88 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 8189888004 + 3866103684 = 90498^2 + 62178^2 .

It is a super-2 number, since 2×12055991688² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48481 + ... + 162672.

Almost surely, 2^12055991688 is an apocalyptic number.

12055991688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12055991688 is an abundant number, since it is smaller than the sum of its proper divisors (23683934352).

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

12055991688 is a wasteful number, since it uses less digits than its factorization.

12055991688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211239 (or 211232 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 54.

The spelling of 12055991688 in words is "twelve billion, fifty-five million, nine hundred ninety-one thousand, six hundred eighty-eight".