55999991040 has 1152 divisors, whose sum is σ = 229935283200. Its totient is φ = 11560550400.

The previous prime is 55999991029. The next prime is 55999991063. The reversal of 55999991040 is 4019999955.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 918032610 + ... + 918032670.

It is an arithmetic number, because the mean of its divisors is an integer number (199596600).

Almost surely, 2^55999991040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55999991040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114967641600).

55999991040 is an abundant number, since it is smaller than the sum of its proper divisors (173935292160).

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

55999991040 is a wasteful number, since it uses less digits than its factorization.

55999991040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 5904900, while the sum is 60.

The spelling of 55999991040 in words is "fifty-five billion, nine hundred ninety-nine million, nine hundred ninety-one thousand, forty".