157881510323021 has 2 divisors, whose sum is σ = 157881510323022. Its totient is φ = 157881510323020.

The previous prime is 157881510322889. The next prime is 157881510323027. The reversal of 157881510323021 is 120323015188751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152155037392996 + 5726472930025 = 12335114^2 + 2393005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157881510323021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157881510323027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78940755161510 + 78940755161511.

It is an arithmetic number, because the mean of its divisors is an integer number (78940755161511).

Almost surely, 2^{157881510323021} is an apocalyptic number.

It is an amenable number.

157881510323021 is a deficient number, since it is larger than the sum of its proper divisors (1).

157881510323021 is an equidigital number, since it uses as much as digits as its factorization.

157881510323021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 157881510323021 in words is "one hundred fifty-seven trillion, eight hundred eighty-one billion, five hundred ten million, three hundred twenty-three thousand, twenty-one".