55861857 has 12 divisors (see below), whose sum is σ = 80877264. Its totient is φ = 37154520.

The previous prime is 55861837. The next prime is 55861867. The reversal of 55861857 is 75816855.

55861857 is a `hidden beast` number, since 5 + 586 + 18 + 57 = 666.

It is not a de Polignac number, because 55861857 - 2¹¹ = 55859809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55861837) 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 11 ways as a sum of consecutive naturals, for example, 3019 + ... + 10992.

It is an arithmetic number, because the mean of its divisors is an integer number (6739772).

Almost surely, 2^55861857 is an apocalyptic number.

It is an amenable number.

55861857 is a deficient number, since it is larger than the sum of its proper divisors (25015407).

55861857 is a wasteful number, since it uses less digits than its factorization.

55861857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14460 (or 14457 counting only the distinct ones).

The product of its digits is 336000, while the sum is 45.

The square root of 55861857 is about 7474.0790068075. The cubic root of 55861857 is about 382.2713845965.

The spelling of 55861857 in words is "fifty-five million, eight hundred sixty-one thousand, eight hundred fifty-seven".