55915857 has 12 divisors (see below), whose sum is σ = 83552820. Its totient is φ = 35991648.

The previous prime is 55915831. The next prime is 55915861. The reversal of 55915857 is 75851955.

55915857 is a `hidden beast` number, since 5 + 591 + 5 + 8 + 57 = 666.

55915857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 28132416 + 27783441 = 5304^2 + 5271^2 .

It is not a de Polignac number, because 55915857 - 2⁶ = 55915793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55915897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106858 + ... + 107379.

It is an arithmetic number, because the mean of its divisors is an integer number (6962735).

Almost surely, 2^55915857 is an apocalyptic number.

It is an amenable number.

55915857 is a deficient number, since it is larger than the sum of its proper divisors (27636963).

55915857 is a wasteful number, since it uses less digits than its factorization.

55915857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214272 (or 214269 counting only the distinct ones).

The product of its digits is 315000, while the sum is 45.

The square root of 55915857 is about 7477.6906194359. The cubic root of 55915857 is about 382.3945217298.

The spelling of 55915857 in words is "fifty-five million, nine hundred fifteen thousand, eight hundred fifty-seven".