157609256557 has 2 divisors, whose sum is σ = 157609256558. Its totient is φ = 157609256556.

The previous prime is 157609256509. The next prime is 157609256621. The reversal of 157609256557 is 755652906751.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116987257156 + 40621999401 = 342034^2 + 201549^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157609256557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157609256657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78804628278 + 78804628279.

It is an arithmetic number, because the mean of its divisors is an integer number (78804628279).

Almost surely, 2^157609256557 is an apocalyptic number.

It is an amenable number.

157609256557 is a deficient number, since it is larger than the sum of its proper divisors (1).

157609256557 is an equidigital number, since it uses as much as digits as its factorization.

157609256557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19845000, while the sum is 58.

The spelling of 157609256557 in words is "one hundred fifty-seven billion, six hundred nine million, two hundred fifty-six thousand, five hundred fifty-seven".