55185993666 has 24 divisors (see below), whose sum is σ = 122113689984. Its totient is φ = 18003940920.

The previous prime is 55185993631. The next prime is 55185993697. The reversal of 55185993666 is 66639958155.

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, 32614990 + ... + 32616681.

It is an arithmetic number, because the mean of its divisors is an integer number (5088070416).

Almost surely, 2^55185993666 is an apocalyptic number.

55185993666 is an abundant number, since it is smaller than the sum of its proper divisors (66927696318).

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

55185993666 is a wasteful number, since it uses less digits than its factorization.

55185993666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65231726 (or 65231723 counting only the distinct ones).

The product of its digits is 52488000, while the sum is 63.

The spelling of 55185993666 in words is "fifty-five billion, one hundred eighty-five million, nine hundred ninety-three thousand, six hundred sixty-six".