664632631 has 8 divisors (see below), whose sum is σ = 716249520. Its totient is φ = 613085952.

The previous prime is 664632607. The next prime is 664632641. The reversal of 664632631 is 136236466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664632631 is a prime.

It is a super-2 number, since 2×664632631² = 883473068379964322, 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 (664632641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3015 + ... + 36583.

It is an arithmetic number, because the mean of its divisors is an integer number (89531190).

Almost surely, 2^664632631 is an apocalyptic number.

664632631 is a deficient number, since it is larger than the sum of its proper divisors (51616889).

664632631 is a wasteful number, since it uses less digits than its factorization.

664632631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35105.

The product of its digits is 93312, while the sum is 37.

The square root of 664632631 is about 25780.4699530478. The cubic root of 664632631 is about 872.6911127238.

The spelling of 664632631 in words is "six hundred sixty-four million, six hundred thirty-two thousand, six hundred thirty-one".