55871565 has 16 divisors (see below), whose sum is σ = 90528000. Its totient is φ = 29420352.

The previous prime is 55871551. The next prime is 55871581. The reversal of 55871565 is 56517855.

It is not a de Polignac number, because 55871565 - 2⁴ = 55871549 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 22390 + ... + 24759.

It is an arithmetic number, because the mean of its divisors is an integer number (5658000).

Almost surely, 2^55871565 is an apocalyptic number.

It is an amenable number.

55871565 is a deficient number, since it is larger than the sum of its proper divisors (34656435).

55871565 is a wasteful number, since it uses less digits than its factorization.

55871565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47236.

The product of its digits is 210000, while the sum is 42.

The square root of 55871565 is about 7474.7284231603. The cubic root of 55871565 is about 382.2935277656.

The spelling of 55871565 in words is "fifty-five million, eight hundred seventy-one thousand, five hundred sixty-five".