157710671621 has 2 divisors, whose sum is σ = 157710671622. Its totient is φ = 157710671620.

The previous prime is 157710671561. The next prime is 157710671633. The reversal of 157710671621 is 126176017751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133744535521 + 23966136100 = 365711^2 + 154810^2 .

It is a cyclic number.

It is not a de Polignac number, because 157710671621 - 2²⁶ = 157643562757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157710671641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78855335810 + 78855335811.

It is an arithmetic number, because the mean of its divisors is an integer number (78855335811).

Almost surely, 2^157710671621 is an apocalyptic number.

It is an amenable number.

157710671621 is a deficient number, since it is larger than the sum of its proper divisors (1).

157710671621 is an equidigital number, since it uses as much as digits as its factorization.

157710671621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 123480, while the sum is 44.

The spelling of 157710671621 in words is "one hundred fifty-seven billion, seven hundred ten million, six hundred seventy-one thousand, six hundred twenty-one".