55631936640 has 512 divisors, whose sum is σ = 206893209600. Its totient is φ = 12453543936.

The previous prime is 55631936557. The next prime is 55631936707. The reversal of 55631936640 is 4663913655.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 55631936640.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 181211367 + ... + 181211673.

It is an arithmetic number, because the mean of its divisors is an integer number (404088300).

Almost surely, 2^55631936640 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 55631936640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103446604800).

55631936640 is an abundant number, since it is smaller than the sum of its proper divisors (151261272960).

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

55631936640 is a wasteful number, since it uses less digits than its factorization.

55631936640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 560 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 48.

The spelling of 55631936640 in words is "fifty-five billion, six hundred thirty-one million, nine hundred thirty-six thousand, six hundred forty".