15715397137 has 4 divisors (see below), whose sum is σ = 17144069616. Its totient is φ = 14286724660.

The previous prime is 15715397101. The next prime is 15715397171. The reversal of 15715397137 is 73179351751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15715397137 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15715337137) 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, 714336223 + ... + 714336244.

It is an arithmetic number, because the mean of its divisors is an integer number (4286017404).

Almost surely, 2^15715397137 is an apocalyptic number.

It is an amenable number.

15715397137 is a deficient number, since it is larger than the sum of its proper divisors (1428672479).

15715397137 is a wasteful number, since it uses less digits than its factorization.

15715397137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1428672478.

The product of its digits is 694575, while the sum is 49.

The spelling of 15715397137 in words is "fifteen billion, seven hundred fifteen million, three hundred ninety-seven thousand, one hundred thirty-seven".