12691643932 has 24 divisors (see below), whose sum is σ = 24464748672. Its totient is φ = 5712918000.

The previous prime is 12691643917. The next prime is 12691643971. The reversal of 12691643932 is 23934619621.

It is a super-2 number, since 2×12691643932² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1395694 + ... + 1404757.

It is an arithmetic number, because the mean of its divisors is an integer number (1019364528).

Almost surely, 2^12691643932 is an apocalyptic number.

It is an amenable number.

12691643932 is a deficient number, since it is larger than the sum of its proper divisors (11773104740).

12691643932 is a wasteful number, since it uses less digits than its factorization.

12691643932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800569 (or 2800567 counting only the distinct ones).

The product of its digits is 419904, while the sum is 46.

The spelling of 12691643932 in words is "twelve billion, six hundred ninety-one million, six hundred forty-three thousand, nine hundred thirty-two".