51664051 has 4 divisors (see below), whose sum is σ = 53445600. Its totient is φ = 49882504.

The previous prime is 51664033. The next prime is 51664057. The reversal of 51664051 is 15046615.

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

It is a cyclic number.

It is not a de Polignac number, because 51664051 - 2¹⁷ = 51532979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51664057) 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, 890731 + ... + 890788.

It is an arithmetic number, because the mean of its divisors is an integer number (13361400).

Almost surely, 2^51664051 is an apocalyptic number.

51664051 is a deficient number, since it is larger than the sum of its proper divisors (1781549).

51664051 is a wasteful number, since it uses less digits than its factorization.

51664051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781548.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51664051 is about 7187.7709340240. The cubic root of 51664051 is about 372.4455749802.

The spelling of 51664051 in words is "fifty-one million, six hundred sixty-four thousand, fifty-one".