664646275 has 12 divisors (see below), whose sum is σ = 824759712. Its totient is φ = 531331040.

The previous prime is 664646267. The next prime is 664646287. The reversal of 664646275 is 572646466.

It is not a de Polignac number, because 664646275 - 2³ = 664646267 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, 28422 + ... + 46228.

It is an arithmetic number, because the mean of its divisors is an integer number (68729976).

Almost surely, 2^664646275 is an apocalyptic number.

664646275 is a deficient number, since it is larger than the sum of its proper divisors (160113437).

664646275 is a wasteful number, since it uses less digits than its factorization.

664646275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19310 (or 19305 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 46.

The square root of 664646275 is about 25780.7345706052. The cubic root of 664646275 is about 872.6970844017.

The spelling of 664646275 in words is "six hundred sixty-four million, six hundred forty-six thousand, two hundred seventy-five".