654665631 has 24 divisors (see below), whose sum is σ = 936384384. Its totient is φ = 406727040.

The previous prime is 654665617. The next prime is 654665659. The reversal of 654665631 is 136566456.

It is not a de Polignac number, because 654665631 - 2⁶ = 654665567 is a prime.

It is a super-2 number, since 2×654665631² = 857174176825256322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654665131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85636 + ... + 92966.

It is an arithmetic number, because the mean of its divisors is an integer number (39016016).

Almost surely, 2^654665631 is an apocalyptic number.

654665631 is a deficient number, since it is larger than the sum of its proper divisors (281718753).

654665631 is a wasteful number, since it uses less digits than its factorization.

654665631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7471 (or 7454 counting only the distinct ones).

The product of its digits is 388800, while the sum is 42.

The square root of 654665631 is about 25586.4345112796. The cubic root of 654665631 is about 868.3067568573.

The spelling of 654665631 in words is "six hundred fifty-four million, six hundred sixty-five thousand, six hundred thirty-one".