157633657 has 4 divisors (see below), whose sum is σ = 161299600. Its totient is φ = 153967716.

The previous prime is 157633613. The next prime is 157633681. The reversal of 157633657 is 756336751.

It is a happy number.

157633657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 157633657 - 2⁷ = 157633529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 3665899 = 157633657 / (1 + 5 + 7 + 6 + 3 + 3 + 6 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157633457) 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, 1832907 + ... + 1832992.

It is an arithmetic number, because the mean of its divisors is an integer number (40324900).

Almost surely, 2^157633657 is an apocalyptic number.

It is an amenable number.

157633657 is a deficient number, since it is larger than the sum of its proper divisors (3665943).

157633657 is an equidigital number, since it uses as much as digits as its factorization.

157633657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3665942.

The product of its digits is 396900, while the sum is 43.

The square root of 157633657 is about 12555.2242911069. The cubic root of 157633657 is about 540.1938684329.

The spelling of 157633657 in words is "one hundred fifty-seven million, six hundred thirty-three thousand, six hundred fifty-seven".