157656693 has 4 divisors (see below), whose sum is σ = 210208928. Its totient is φ = 105104460.

The previous prime is 157656683. The next prime is 157656701. The reversal of 157656693 is 396656751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 157656693 - 2²⁰ = 156608117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157656613) 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, 26276113 + ... + 26276118.

It is an arithmetic number, because the mean of its divisors is an integer number (52552232).

Almost surely, 2^157656693 is an apocalyptic number.

It is an amenable number.

157656693 is a deficient number, since it is larger than the sum of its proper divisors (52552235).

157656693 is an equidigital number, since it uses as much as digits as its factorization.

157656693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52552234.

The product of its digits is 1020600, while the sum is 48.

The square root of 157656693 is about 12556.1416446295. The cubic root of 157656693 is about 540.2201811296.

The spelling of 157656693 in words is "one hundred fifty-seven million, six hundred fifty-six thousand, six hundred ninety-three".