664549475 has 12 divisors (see below), whose sum is σ = 824444256. Its totient is φ = 531379680.

The previous prime is 664549469. The next prime is 664549513. The reversal of 664549475 is 574945466.

664549475 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 664549475 - 2²⁰ = 663500899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58349 + ... + 68801.

It is an arithmetic number, because the mean of its divisors is an integer number (68703688).

Almost surely, 2^664549475 is an apocalyptic number.

664549475 is a deficient number, since it is larger than the sum of its proper divisors (159894781).

664549475 is a wasteful number, since it uses less digits than its factorization.

664549475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13006 (or 13001 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 50.

The square root of 664549475 is about 25778.8571313780. The cubic root of 664549475 is about 872.6547154092.

The spelling of 664549475 in words is "six hundred sixty-four million, five hundred forty-nine thousand, four hundred seventy-five".