157710671681 has 2 divisors, whose sum is σ = 157710671682. Its totient is φ = 157710671680.

The previous prime is 157710671641. The next prime is 157710671687. The reversal of 157710671681 is 186176017751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103925640625 + 53785031056 = 322375^2 + 231916^2 .

It is a cyclic number.

It is not a de Polignac number, because 157710671681 - 2²² = 157706477377 is a prime.

It is a super-2 number, since 2×157710671681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (157710671687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78855335840 + 78855335841.

It is an arithmetic number, because the mean of its divisors is an integer number (78855335841).

Almost surely, 2^157710671681 is an apocalyptic number.

It is an amenable number.

157710671681 is a deficient number, since it is larger than the sum of its proper divisors (1).

157710671681 is an equidigital number, since it uses as much as digits as its factorization.

157710671681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 493920, while the sum is 50.

The spelling of 157710671681 in words is "one hundred fifty-seven billion, seven hundred ten million, six hundred seventy-one thousand, six hundred eighty-one".