631664001 has 20 divisors (see below), whose sum is σ = 949072212. Its totient is φ = 418665888.

The previous prime is 631663997. The next prime is 631664003. The reversal of 631664001 is 100466136.

631664001 is a `hidden beast` number, since 6 + 3 + 16 + 640 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 481846401 + 149817600 = 21951^2 + 12240^2 .

It is not a de Polignac number, because 631664001 - 2² = 631663997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (631664003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8526 + ... + 36551.

Almost surely, 2^631664001 is an apocalyptic number.

It is an amenable number.

631664001 is a deficient number, since it is larger than the sum of its proper divisors (317408211).

631664001 is a wasteful number, since it uses less digits than its factorization.

631664001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45262 (or 45253 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 631664001 is about 25132.9266302196. The cubic root of 631664001 is about 858.0159784789.

The spelling of 631664001 in words is "six hundred thirty-one million, six hundred sixty-four thousand, one".