12995724638 has 16 divisors (see below), whose sum is σ = 21905837856. Its totient is φ = 5737242720.

The previous prime is 12995724629. The next prime is 12995724653. The reversal of 12995724638 is 83642759921.

It is a congruent number.

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, 10865393 + ... + 10866588.

It is an arithmetic number, because the mean of its divisors is an integer number (1369114866).

Almost surely, 2^12995724638 is an apocalyptic number.

12995724638 is a deficient number, since it is larger than the sum of its proper divisors (8910113218).

12995724638 is a wasteful number, since it uses less digits than its factorization.

12995724638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21732019.

The product of its digits is 6531840, while the sum is 56.

The spelling of 12995724638 in words is "twelve billion, nine hundred ninety-five million, seven hundred twenty-four thousand, six hundred thirty-eight".