15715397138 has 16 divisors (see below), whose sum is σ = 26998380864. Its totient is φ = 6720745200.

The previous prime is 15715397101. The next prime is 15715397171. The reversal of 15715397138 is 83179351751.

It is a Curzon 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, 1195313 + ... + 1208388.

It is an arithmetic number, because the mean of its divisors is an integer number (1687398804).

Almost surely, 2^15715397138 is an apocalyptic number.

15715397138 is a deficient number, since it is larger than the sum of its proper divisors (11282983726).

15715397138 is a wasteful number, since it uses less digits than its factorization.

15715397138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404177.

The product of its digits is 793800, while the sum is 50.

The spelling of 15715397138 in words is "fifteen billion, seven hundred fifteen million, three hundred ninety-seven thousand, one hundred thirty-eight".