664364775 has 24 divisors (see below), whose sum is σ = 1146176640. Its totient is φ = 338921440.

The previous prime is 664364761. The next prime is 664364803. The reversal of 664364775 is 577463466.

It is not a de Polignac number, because 664364775 - 2¹⁰ = 664363751 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190845 + ... + 194294.

It is an arithmetic number, because the mean of its divisors is an integer number (47757360).

Almost surely, 2^664364775 is an apocalyptic number.

664364775 is a deficient number, since it is larger than the sum of its proper divisors (481811865).

664364775 is a wasteful number, since it uses less digits than its factorization.

664364775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385175 (or 385170 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 48.

The square root of 664364775 is about 25775.2744893241. The cubic root of 664364775 is about 872.5738615040.

The spelling of 664364775 in words is "six hundred sixty-four million, three hundred sixty-four thousand, seven hundred seventy-five".