51566816 has 36 divisors (see below), whose sum is σ = 118100808. Its totient is φ = 22099392.

The previous prime is 51566813. The next prime is 51566869. The reversal of 51566816 is 61866515.

It is a self number, because there is not a number n which added to its sum of digits gives 51566816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51566813) 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 5 ways as a sum of consecutive naturals, for example, 14876 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (3280578).

Almost surely, 2^51566816 is an apocalyptic number.

51566816 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51566816 is an abundant number, since it is smaller than the sum of its proper divisors (66533992).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51566816 is a wasteful number, since it uses less digits than its factorization.

51566816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32911 (or 32896 counting only the distinct ones).

The product of its digits is 43200, while the sum is 38.

The square root of 51566816 is about 7181.0038295492. The cubic root of 51566816 is about 372.2117728938.

The spelling of 51566816 in words is "fifty-one million, five hundred sixty-six thousand, eight hundred sixteen".