55663866 has 24 divisors (see below), whose sum is σ = 120744000. Its totient is φ = 18533256.

The previous prime is 55663849. The next prime is 55663891. The reversal of 55663866 is 66836655.

55663866 is a `hidden beast` number, since 5 + 5 + 6 + 638 + 6 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25951 + ... + 28013.

It is an arithmetic number, because the mean of its divisors is an integer number (5031000).

Almost surely, 2^55663866 is an apocalyptic number.

55663866 is an abundant number, since it is smaller than the sum of its proper divisors (65080134).

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

55663866 is a wasteful number, since it uses less digits than its factorization.

55663866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3570 (or 3567 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The square root of 55663866 is about 7460.8220726673. The cubic root of 55663866 is about 381.8192222297.

The spelling of 55663866 in words is "fifty-five million, six hundred sixty-three thousand, eight hundred sixty-six".