65623631 has 4 divisors (see below), whose sum is σ = 65695200. Its totient is φ = 65552064.

The previous prime is 65623601. The next prime is 65623693. The reversal of 65623631 is 13632656.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65623631 - 2¹⁰ = 65622607 is a prime.

It is a super-2 number, since 2×65623631² = 8612921891248322, 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 (65623601) 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, 34391 + ... + 36248.

It is an arithmetic number, because the mean of its divisors is an integer number (16423800).

Almost surely, 2^65623631 is an apocalyptic number.

65623631 is a deficient number, since it is larger than the sum of its proper divisors (71569).

65623631 is an equidigital number, since it uses as much as digits as its factorization.

65623631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71568.

The product of its digits is 19440, while the sum is 32.

The square root of 65623631 is about 8100.8413760547. The cubic root of 65623631 is about 403.3543566818.

The spelling of 65623631 in words is "sixty-five million, six hundred twenty-three thousand, six hundred thirty-one".