657557157 has 4 divisors (see below), whose sum is σ = 876742880. Its totient is φ = 438371436.

The previous prime is 657557137. The next prime is 657557171. The reversal of 657557157 is 751755756.

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 657557157 - 2⁸ = 657556901 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 (657557137) 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, 109592857 + ... + 109592862.

It is an arithmetic number, because the mean of its divisors is an integer number (219185720).

Almost surely, 2^657557157 is an apocalyptic number.

It is an amenable number.

657557157 is a deficient number, since it is larger than the sum of its proper divisors (219185723).

657557157 is a wasteful number, since it uses less digits than its factorization.

657557157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219185722.

The product of its digits is 1286250, while the sum is 48.

The square root of 657557157 is about 25642.8773151532. The cubic root of 657557157 is about 869.5832579308.

The spelling of 657557157 in words is "six hundred fifty-seven million, five hundred fifty-seven thousand, one hundred fifty-seven".