55188639792 has 480 divisors, whose sum is σ = 199277245440. Its totient is φ = 14526812160.

The previous prime is 55188639787. The next prime is 55188639827. The reversal of 55188639792 is 29793688155.

55188639792 is a `hidden beast` number, since 5 + 518 + 86 + 39 + 7 + 9 + 2 = 666.

It is a super-2 number, since 2×55188639792² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9448809 + ... + 9454647.

It is an arithmetic number, because the mean of its divisors is an integer number (415160928).

Almost surely, 2^55188639792 is an apocalyptic number.

55188639792 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55188639792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99638622720).

55188639792 is an abundant number, since it is smaller than the sum of its proper divisors (144088605648).

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

55188639792 is a wasteful number, since it uses less digits than its factorization.

55188639792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5903 (or 5885 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 63.

The spelling of 55188639792 in words is "fifty-five billion, one hundred eighty-eight million, six hundred thirty-nine thousand, seven hundred ninety-two".