51664274 has 4 divisors (see below), whose sum is σ = 77496414. Its totient is φ = 25832136.

The previous prime is 51664273. The next prime is 51664331. The reversal of 51664274 is 47246615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42706225 + 8958049 = 6535^2 + 2993^2 .

It is not an unprimeable number, because it can be changed into a prime (51664271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12916067 + ... + 12916070.

Almost surely, 2^51664274 is an apocalyptic number.

51664274 is a deficient number, since it is larger than the sum of its proper divisors (25832140).

51664274 is a wasteful number, since it uses less digits than its factorization.

51664274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25832139.

The product of its digits is 40320, while the sum is 35.

The square root of 51664274 is about 7187.7864464660. The cubic root of 51664274 is about 372.4461108476.

The spelling of 51664274 in words is "fifty-one million, six hundred sixty-four thousand, two hundred seventy-four".