51664575 has 12 divisors (see below), whose sum is σ = 85418888. Its totient is φ = 27554400.

The previous prime is 51664567. The next prime is 51664577. The reversal of 51664575 is 57546615.

It is not a de Polignac number, because 51664575 - 2³ = 51664567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51664577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 344356 + ... + 344505.

Almost surely, 2^51664575 is an apocalyptic number.

51664575 is a deficient number, since it is larger than the sum of its proper divisors (33754313).

51664575 is a wasteful number, since it uses less digits than its factorization.

51664575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688874 (or 688869 counting only the distinct ones).

The product of its digits is 126000, while the sum is 39.

The square root of 51664575 is about 7187.8073847315. The cubic root of 51664575 is about 372.4468341460.

The spelling of 51664575 in words is "fifty-one million, six hundred sixty-four thousand, five hundred seventy-five".