157512756777021 has 6 divisors (see below), whose sum is σ = 227518426455710. Its totient is φ = 105008504518008.

The previous prime is 157512756776957. The next prime is 157512756777023. The reversal of 157512756777021 is 120777657215751.

It is a happy number.

157512756777021 is a `hidden beast` number, since 1 + 57 + 5 + 12 + 7 + 567 + 7 + 7 + 0 + 2 + 1 = 666.

157512756777021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 95656498011396 + 61856258765625 = 9780414^2 + 7864875^2 .

It is not a de Polignac number, because 157512756777021 - 2⁶ = 157512756776957 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 157512756777021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157512756777023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8750708709826 + ... + 8750708709843.

Almost surely, 2^{157512756777021} is an apocalyptic number.

It is an amenable number.

157512756777021 is a deficient number, since it is larger than the sum of its proper divisors (70005669678689).

157512756777021 is a wasteful number, since it uses less digits than its factorization.

157512756777021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17501417419675 (or 17501417419672 counting only the distinct ones).

The product of its (nonzero) digits is 50421000, while the sum is 63.

The spelling of 157512756777021 in words is "one hundred fifty-seven trillion, five hundred twelve billion, seven hundred fifty-six million, seven hundred seventy-seven thousand, twenty-one".