664507773 has 8 divisors (see below), whose sum is σ = 984456000. Its totient is φ = 443005164.

The previous prime is 664507759. The next prime is 664507793. The reversal of 664507773 is 377705466.

664507773 is a `hidden beast` number, since 66 + 450 + 77 + 73 = 666.

It is not a de Polignac number, because 664507773 - 2⁴ = 664507757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664507733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12305673 + ... + 12305726.

It is an arithmetic number, because the mean of its divisors is an integer number (123057000).

Almost surely, 2^664507773 is an apocalyptic number.

It is an amenable number.

664507773 is a deficient number, since it is larger than the sum of its proper divisors (319948227).

664507773 is a wasteful number, since it uses less digits than its factorization.

664507773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24611408 (or 24611402 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 45.

The square root of 664507773 is about 25778.0482775558. The cubic root of 664507773 is about 872.6364613340.

The spelling of 664507773 in words is "six hundred sixty-four million, five hundred seven thousand, seven hundred seventy-three".