157502515710721 has 4 divisors (see below), whose sum is σ = 159061946559444. Its totient is φ = 155943084862000.

The previous prime is 157502515710713. The next prime is 157502515710733. The reversal of 157502515710721 is 127017515205751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125445913669696 + 32056602041025 = 11200264^2 + 5661855^2 .

It is a cyclic number.

It is not a de Polignac number, because 157502515710721 - 2³ = 157502515710713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157502515719721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 779715424210 + ... + 779715424411.

It is an arithmetic number, because the mean of its divisors is an integer number (39765486639861).

Almost surely, 2^{157502515710721} is an apocalyptic number.

It is an amenable number.

157502515710721 is a deficient number, since it is larger than the sum of its proper divisors (1559430848723).

157502515710721 is a wasteful number, since it uses less digits than its factorization.

157502515710721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1559430848722.

The product of its (nonzero) digits is 857500, while the sum is 49.

The spelling of 157502515710721 in words is "one hundred fifty-seven trillion, five hundred two billion, five hundred fifteen million, seven hundred ten thousand, seven hundred twenty-one".