664972497 has 40 divisors (see below), whose sum is σ = 1159462656. Its totient is φ = 371884608.

The previous prime is 664972487. The next prime is 664972499. The reversal of 664972497 is 794279466.

It is a happy number.

664972497 is a `hidden beast` number, since 6 + 64 + 97 + 2 + 497 = 666.

664972497 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664972497 - 2⁶ = 664972433 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664972499) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 14173 + ... + 39125.

Almost surely, 2^664972497 is an apocalyptic number.

It is an amenable number.

664972497 is a deficient number, since it is larger than the sum of its proper divisors (494490159).

664972497 is a wasteful number, since it uses less digits than its factorization.

664972497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25019 (or 25010 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 54.

The square root of 664972497 is about 25787.0606506442. The cubic root of 664972497 is about 872.8398402474.

The spelling of 664972497 in words is "six hundred sixty-four million, nine hundred seventy-two thousand, four hundred ninety-seven".