445664331 has 24 divisors (see below), whose sum is σ = 740230400. Its totient is φ = 253097136.

The previous prime is 445664327. The next prime is 445664357. The reversal of 445664331 is 133466544.

445664331 is a `hidden beast` number, since 4 + 4 + 5 + 6 + 643 + 3 + 1 = 666.

It is not a de Polignac number, because 445664331 - 2² = 445664327 is a prime.

It is a super-2 number, since 2×445664331² = 397233391851355122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (445664381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11431 + ... + 31968.

Almost surely, 2^445664331 is an apocalyptic number.

445664331 is a deficient number, since it is larger than the sum of its proper divisors (294566069).

445664331 is a wasteful number, since it uses less digits than its factorization.

445664331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43575 (or 43572 counting only the distinct ones).

The product of its digits is 103680, while the sum is 36.

The square root of 445664331 is about 21110.7633921656. The cubic root of 445664331 is about 763.8404012950.

The spelling of 445664331 in words is "four hundred forty-five million, six hundred sixty-four thousand, three hundred thirty-one".