664893275 has 12 divisors (see below), whose sum is σ = 825773784. Its totient is φ = 531072000.

The previous prime is 664893263. The next prime is 664893287. The reversal of 664893275 is 572398466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664893263) and next prime (664893287).

It is not a de Polignac number, because 664893275 - 2⁴ = 664893259 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, 4721 + ... + 36770.

It is an arithmetic number, because the mean of its divisors is an integer number (68814482).

Almost surely, 2^664893275 is an apocalyptic number.

664893275 is a deficient number, since it is larger than the sum of its proper divisors (160880509).

664893275 is a wasteful number, since it uses less digits than its factorization.

664893275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42142 (or 42137 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 50.

The square root of 664893275 is about 25785.5245244304. The cubic root of 664893275 is about 872.8051767266.

The spelling of 664893275 in words is "six hundred sixty-four million, eight hundred ninety-three thousand, two hundred seventy-five".