12691608704 has 32 divisors (see below), whose sum is σ = 25445149500. Its totient is φ = 6305375232.

The previous prime is 12691608703. The next prime is 12691608737. The reversal of 12691608704 is 40780619621.

It can be written as a sum of positive squares in 2 ways, for example, as 12285505600 + 406103104 = 110840^2 + 20152^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×12691608704² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12691608703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295679 + ... + 335870.

Almost surely, 2^12691608704 is an apocalyptic number.

It is an amenable number.

12691608704 is an abundant number, since it is smaller than the sum of its proper divisors (12753540796).

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

12691608704 is an equidigital number, since it uses as much as digits as its factorization.

12691608704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631720 (or 631708 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 12691608704 in words is "twelve billion, six hundred ninety-one million, six hundred eight thousand, seven hundred four".