51664156 has 24 divisors (see below), whose sum is σ = 97962480. Its totient is φ = 23745792.

The previous prime is 51664127. The next prime is 51664157. The reversal of 51664156 is 65146615.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51664157) 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 in 7 ways as a sum of consecutive naturals, for example, 5911 + ... + 11758.

It is an arithmetic number, because the mean of its divisors is an integer number (4081770).

Almost surely, 2^51664156 is an apocalyptic number.

It is an amenable number.

51664156 is a deficient number, since it is larger than the sum of its proper divisors (46298324).

51664156 is a wasteful number, since it uses less digits than its factorization.

51664156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17733 (or 17731 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 51664156 is about 7187.7782380928. The cubic root of 51664156 is about 372.4458272946.

The spelling of 51664156 in words is "fifty-one million, six hundred sixty-four thousand, one hundred fifty-six".