664954407 has 32 divisors (see below), whose sum is σ = 1071456960. Its totient is φ = 405129600.

The previous prime is 664954379. The next prime is 664954429. The reversal of 664954407 is 704459466.

664954407 is a `hidden beast` number, since 66 + 49 + 544 + 0 + 7 = 666.

664954407 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 664954407 - 2¹¹ = 664952359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664954447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26073 + ... + 44829.

It is an arithmetic number, because the mean of its divisors is an integer number (33483030).

Almost surely, 2^664954407 is an apocalyptic number.

664954407 is a deficient number, since it is larger than the sum of its proper divisors (406502553).

664954407 is a wasteful number, since it uses less digits than its factorization.

664954407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18880 (or 18874 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The square root of 664954407 is about 25786.7098909496. The cubic root of 664954407 is about 872.8319252254.

The spelling of 664954407 in words is "six hundred sixty-four million, nine hundred fifty-four thousand, four hundred seven".