157668157 has 6 divisors (see below), whose sum is σ = 163293338. Its totient is φ = 152230512.

The previous prime is 157668019. The next prime is 157668179. The reversal of 157668157 is 751866751.

It can be written as a sum of positive squares in 3 ways, for example, as 20169081 + 137499076 = 4491^2 + 11726^2 .

It is not a de Polignac number, because 157668157 - 2²³ = 149279549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157668187) 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, 92898 + ... + 94579.

Almost surely, 2^157668157 is an apocalyptic number.

It is an amenable number.

157668157 is a deficient number, since it is larger than the sum of its proper divisors (5625181).

157668157 is an equidigital number, since it uses as much as digits as its factorization.

157668157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187535 (or 187506 counting only the distinct ones).

The product of its digits is 352800, while the sum is 46.

The square root of 157668157 is about 12556.5981459948. The cubic root of 157668157 is about 540.2332748417.

The spelling of 157668157 in words is "one hundred fifty-seven million, six hundred sixty-eight thousand, one hundred fifty-seven".