157664160360721 has 27 divisors (see below), whose sum is σ = 186572635457481. Its totient is φ = 132845818750344.

The previous prime is 157664160360673. The next prime is 157664160360767. The reversal of 157664160360721 is 127063061466751.

The square root of 157664160360721 is 12556439.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 157664160360721 - 2¹⁵ = 157664160327953 is a prime.

It is a super-2 number, since 2×157664160360721² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (157664160360821) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5185794106 + ... + 5185824508.

Almost surely, 2^{157664160360721} is an apocalyptic number.

157664160360721 is the 12556439-th square number.

157664160360721 is the 6278220-th centered octagonal number.

It is an amenable number.

157664160360721 is a deficient number, since it is larger than the sum of its proper divisors (28908475096760).

157664160360721 is an frugal number, since it uses more digits than its factorization.

157664160360721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60938 (or 30469 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 55.

The spelling of 157664160360721 in words is "one hundred fifty-seven trillion, six hundred sixty-four billion, one hundred sixty million, three hundred sixty thousand, seven hundred twenty-one".