12691640832 has 80 divisors (see below), whose sum is σ = 36412252800. Its totient is φ = 3905114112.

The previous prime is 12691640827. The next prime is 12691640867. The reversal of 12691640832 is 23804619621.

It is a super-2 number, since 2×12691640832² (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 7 ways as a sum of consecutive naturals, for example, 297832 + ... + 337767.

It is an arithmetic number, because the mean of its divisors is an integer number (455153160).

Almost surely, 2^12691640832 is an apocalyptic number.

12691640832 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12691640832 is an abundant number, since it is smaller than the sum of its proper divisors (23720611968).

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

12691640832 is an equidigital number, since it uses as much as digits as its factorization.

12691640832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635633 (or 635617 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The spelling of 12691640832 in words is "twelve billion, six hundred ninety-one million, six hundred forty thousand, eight hundred thirty-two".