657599879491 has 16 divisors (see below), whose sum is σ = 676319809536. Its totient is φ = 639009000000.

The previous prime is 657599879483. The next prime is 657599879513. The reversal of 657599879491 is 194978995756.

It is a cyclic number.

It is not a de Polignac number, because 657599879491 - 2³ = 657599879483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (657599879441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53671116 + ... + 53683366.

It is an arithmetic number, because the mean of its divisors is an integer number (42269988096).

Almost surely, 2^657599879491 is an apocalyptic number.

657599879491 is a deficient number, since it is larger than the sum of its proper divisors (18719930045).

657599879491 is a wasteful number, since it uses less digits than its factorization.

657599879491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17394.

The product of its digits is 1543147200, while the sum is 79.

The spelling of 657599879491 in words is "six hundred fifty-seven billion, five hundred ninety-nine million, eight hundred seventy-nine thousand, four hundred ninety-one".