51655905 has 24 divisors (see below), whose sum is σ = 102328512. Its totient is φ = 23613984.

The previous prime is 51655817. The next prime is 51655913. The reversal of 51655905 is 50955615.

51655905 is a `hidden beast` number, since 5 + 1 + 65 + 590 + 5 = 666.

It is not a de Polignac number, because 51655905 - 2⁸ = 51655649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51655905.

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 23 ways as a sum of consecutive naturals, for example, 81679 + ... + 82308.

It is an arithmetic number, because the mean of its divisors is an integer number (4263688).

Almost surely, 2^51655905 is an apocalyptic number.

It is an amenable number.

51655905 is a deficient number, since it is larger than the sum of its proper divisors (50672607).

51655905 is a wasteful number, since it uses less digits than its factorization.

51655905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164005 (or 164002 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 51655905 is about 7187.2042547850. The cubic root of 51655905 is about 372.4259991432.

The spelling of 51655905 in words is "fifty-one million, six hundred fifty-five thousand, nine hundred five".