12638654138 has 16 divisors (see below), whose sum is σ = 20683165536. Its totient is φ = 5744361840.

The previous prime is 12638654129. The next prime is 12638654153. The reversal of 12638654138 is 83145683621.

It is a junction number, because it is equal to n+sod(n) for n = 12638654092 and 12638654101.

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, 473045 + ... + 499047.

It is an arithmetic number, because the mean of its divisors is an integer number (1292697846).

Almost surely, 2^12638654138 is an apocalyptic number.

12638654138 is a deficient number, since it is larger than the sum of its proper divisors (8044511398).

12638654138 is a wasteful number, since it uses less digits than its factorization.

12638654138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48109.

The product of its digits is 829440, while the sum is 47.

The spelling of 12638654138 in words is "twelve billion, six hundred thirty-eight million, six hundred fifty-four thousand, one hundred thirty-eight".