653664631 has 2 divisors, whose sum is σ = 653664632. Its totient is φ = 653664630.

The previous prime is 653664617. The next prime is 653664691. The reversal of 653664631 is 136466356.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-653664631 is a prime.

It is a super-2 number, since 2×653664631² = 854554899640732322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (653664691) 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 as a sum of consecutive naturals, namely, 326832315 + 326832316.

It is an arithmetic number, because the mean of its divisors is an integer number (326832316).

Almost surely, 2^653664631 is an apocalyptic number.

653664631 is a deficient number, since it is larger than the sum of its proper divisors (1).

653664631 is an equidigital number, since it uses as much as digits as its factorization.

653664631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 40.

The square root of 653664631 is about 25566.8658814490. The cubic root of 653664631 is about 867.8639769119.

The spelling of 653664631 in words is "six hundred fifty-three million, six hundred sixty-four thousand, six hundred thirty-one".