15857157137 has 2 divisors, whose sum is σ = 15857157138. Its totient is φ = 15857157136.

The previous prime is 15857157103. The next prime is 15857157227. The reversal of 15857157137 is 73175175851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13081869376 + 2775287761 = 114376^2 + 52681^2 .

It is an emirp because it is prime and its reverse (73175175851) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15857157137 - 2²⁰ = 15856108561 is a prime.

It is not a weakly prime, because it can be changed into another prime (15857157637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7928578568 + 7928578569.

It is an arithmetic number, because the mean of its divisors is an integer number (7928578569).

Almost surely, 2^15857157137 is an apocalyptic number.

It is an amenable number.

15857157137 is a deficient number, since it is larger than the sum of its proper divisors (1).

15857157137 is an equidigital number, since it uses as much as digits as its factorization.

15857157137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1029000, while the sum is 50.

The spelling of 15857157137 in words is "fifteen billion, eight hundred fifty-seven million, one hundred fifty-seven thousand, one hundred thirty-seven".