55136844990 has 320 divisors, whose sum is σ = 165974054400. Its totient is φ = 13067847936.

The previous prime is 55136844943. The next prime is 55136845069. The reversal of 55136844990 is 9944863155.

55136844990 is a `hidden beast` number, since 5 + 51 + 3 + 68 + 449 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 18758941 + ... + 18761879.

It is an arithmetic number, because the mean of its divisors is an integer number (518668920).

Almost surely, 2^55136844990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55136844990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82987027200).

55136844990 is an abundant number, since it is smaller than the sum of its proper divisors (110837209410).

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

55136844990 is a wasteful number, since it uses less digits than its factorization.

55136844990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3053 (or 3044 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 54.

The spelling of 55136844990 in words is "fifty-five billion, one hundred thirty-six million, eight hundred forty-four thousand, nine hundred ninety".