157668931 has 8 divisors (see below), whose sum is σ = 190792800. Its totient is φ = 127195008.

The previous prime is 157668923. The next prime is 157668989. The reversal of 157668931 is 139866751.

It is a happy number.

157668931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157668931 - 2³ = 157668923 is a prime.

It is a super-2 number, since 2×157668931² = 49718983605365522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157668431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 662356 + ... + 662593.

It is an arithmetic number, because the mean of its divisors is an integer number (23849100).

Almost surely, 2^157668931 is an apocalyptic number.

157668931 is a deficient number, since it is larger than the sum of its proper divisors (33123869).

157668931 is a wasteful number, since it uses less digits than its factorization.

157668931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324973.

The product of its digits is 272160, while the sum is 46.

The square root of 157668931 is about 12556.6289664065. The cubic root of 157668931 is about 540.2341588500.

It can be divided in two parts, 1576 and 68931, that added together give a palindrome (70507).

The spelling of 157668931 in words is "one hundred fifty-seven million, six hundred sixty-eight thousand, nine hundred thirty-one".