55011108978 has 48 divisors (see below), whose sum is σ = 136399600896. Its totient is φ = 15696504000.

The previous prime is 55011108863. The next prime is 55011109007. The reversal of 55011108978 is 87980111055.

55011108978 is a `hidden beast` number, since 550 + 1 + 1 + 1 + 0 + 8 + 97 + 8 = 666.

It is a super-2 number, since 2×55011108978² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 196051 + ... + 385302.

It is an arithmetic number, because the mean of its divisors is an integer number (2841658352).

Almost surely, 2^55011108978 is an apocalyptic number.

55011108978 is an abundant number, since it is smaller than the sum of its proper divisors (81388491918).

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

55011108978 is a wasteful number, since it uses less digits than its factorization.

55011108978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582119 (or 582116 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 45.

The spelling of 55011108978 in words is "fifty-five billion, eleven million, one hundred eight thousand, nine hundred seventy-eight".