51656018 has 16 divisors (see below), whose sum is σ = 80391960. Its totient is φ = 24864000.

The previous prime is 51655991. The next prime is 51656027. The reversal of 51656018 is 81065615.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 51509329 + 146689 = 7177^2 + 383^2 .

It is a Curzon number.

It is an unprimeable number.

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, 22148 + ... + 24368.

Almost surely, 2^51656018 is an apocalyptic number.

51656018 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

51656018 is a deficient number, since it is larger than the sum of its proper divisors (28735942).

51656018 is a wasteful number, since it uses less digits than its factorization.

51656018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2653.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 51656018 is about 7187.2121159738. The cubic root of 51656018 is about 372.4262707101.

The spelling of 51656018 in words is "fifty-one million, six hundred fifty-six thousand, eighteen".