655118631 has 16 divisors (see below), whose sum is σ = 993118720. Its totient is φ = 426588120.

The previous prime is 655118627. The next prime is 655118641. The reversal of 655118631 is 136811556.

655118631 is a `hidden beast` number, since 6 + 5 + 5 + 1 + 18 + 631 = 666.

It is not a de Polignac number, because 655118631 - 2² = 655118627 is a prime.

It is a super-2 number, since 2×655118631² = 858360841366628322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655118641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280975 + ... + 283296.

It is an arithmetic number, because the mean of its divisors is an integer number (62069920).

Almost surely, 2^655118631 is an apocalyptic number.

655118631 is a deficient number, since it is larger than the sum of its proper divisors (338000089).

655118631 is a wasteful number, since it uses less digits than its factorization.

655118631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564323 (or 564317 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 655118631 is about 25595.2853275755. The cubic root of 655118631 is about 868.5069874543.

The spelling of 655118631 in words is "six hundred fifty-five million, one hundred eighteen thousand, six hundred thirty-one".