157636881 has 16 divisors (see below), whose sum is σ = 234299520. Its totient is φ = 104747760.

The previous prime is 157636867. The next prime is 157636883. The reversal of 157636881 is 188636751.

157636881 is a `hidden beast` number, since 1 + 5 + 7 + 636 + 8 + 8 + 1 = 666.

It is not a de Polignac number, because 157636881 - 2¹¹ = 157634833 is a prime.

It is a super-2 number, since 2×157636881² = 49698772502816322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (157636883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990 + ... + 17783.

It is an arithmetic number, because the mean of its divisors is an integer number (14643720).

Almost surely, 2^157636881 is an apocalyptic number.

It is an amenable number.

157636881 is a deficient number, since it is larger than the sum of its proper divisors (76662639).

157636881 is a wasteful number, since it uses less digits than its factorization.

157636881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19093 (or 19087 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 157636881 is about 12555.3526832184. The cubic root of 157636881 is about 540.1975511767.

The spelling of 157636881 in words is "one hundred fifty-seven million, six hundred thirty-six thousand, eight hundred eighty-one".