157391357657 has 2 divisors, whose sum is σ = 157391357658. Its totient is φ = 157391357656.

The previous prime is 157391357623. The next prime is 157391357687. The reversal of 157391357657 is 756753193751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112214280256 + 45177077401 = 334984^2 + 212549^2 .

It is an emirp because it is prime and its reverse (756753193751) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 157391357657 - 2²⁰ = 157390309081 is a prime.

It is a super-2 number, since 2×157391357657² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 157391357596 and 157391357605.

It is not a weakly prime, because it can be changed into another prime (157391357687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78695678828 + 78695678829.

It is an arithmetic number, because the mean of its divisors is an integer number (78695678829).

Almost surely, 2^157391357657 is an apocalyptic number.

It is an amenable number.

157391357657 is a deficient number, since it is larger than the sum of its proper divisors (1).

157391357657 is an equidigital number, since it uses as much as digits as its factorization.

157391357657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20837250, while the sum is 59.

The spelling of 157391357657 in words is "one hundred fifty-seven billion, three hundred ninety-one million, three hundred fifty-seven thousand, six hundred fifty-seven".