55531664 has 20 divisors (see below), whose sum is σ = 111064320. Its totient is φ = 26869920.

The previous prime is 55531657. The next prime is 55531681. The reversal of 55531664 is 46613555.

55531664 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55484 + ... + 56475.

It is an arithmetic number, because the mean of its divisors is an integer number (5553216).

Almost surely, 2^55531664 is an apocalyptic number.

It is an amenable number.

55531664 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55531664 is a wasteful number, since it uses less digits than its factorization.

55531664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111998 (or 111992 counting only the distinct ones).

The product of its digits is 54000, while the sum is 35.

The square root of 55531664 is about 7451.9570583841. The cubic root of 55531664 is about 381.5167083338.

The spelling of 55531664 in words is "fifty-five million, five hundred thirty-one thousand, six hundred sixty-four".