55991938500 has 336 divisors, whose sum is σ = 189703790640. Its totient is φ = 14413593600.

The previous prime is 55991938493. The next prime is 55991938537. The reversal of 55991938500 is 583919955.

It is a happy number.

55991938500 is a `hidden beast` number, since 5 + 5 + 99 + 19 + 38 + 500 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 9405896256 + 46586042244 = 96984^2 + 215838^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 10567852 + ... + 10573148.

It is an arithmetic number, because the mean of its divisors is an integer number (564594615).

Almost surely, 2^55991938500 is an apocalyptic number.

55991938500 is a gapful number since it is divisible by the number (50) 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 55991938500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94851895320).

55991938500 is an abundant number, since it is smaller than the sum of its proper divisors (133711852140).

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

55991938500 is a wasteful number, since it uses less digits than its factorization.

55991938500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5363 (or 5336 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 54.

The spelling of 55991938500 in words is "fifty-five billion, nine hundred ninety-one million, nine hundred thirty-eight thousand, five hundred".