51664574 has 8 divisors (see below), whose sum is σ = 83458200. Its totient is φ = 23845176.

The previous prime is 51664567. The next prime is 51664577. The reversal of 51664574 is 47546615.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 993524 + ... + 993575.

It is an arithmetic number, because the mean of its divisors is an integer number (10432275).

Almost surely, 2^51664574 is an apocalyptic number.

51664574 is a deficient number, since it is larger than the sum of its proper divisors (31793626).

51664574 is a wasteful number, since it uses less digits than its factorization.

51664574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987114.

The product of its digits is 100800, while the sum is 38.

The square root of 51664574 is about 7187.8073151692. The cubic root of 51664574 is about 372.4468317430.

The spelling of 51664574 in words is "fifty-one million, six hundred sixty-four thousand, five hundred seventy-four".