55812921648 has 320 divisors, whose sum is σ = 169497722880. Its totient is φ = 15647385600.

The previous prime is 55812921607. The next prime is 55812921679. The reversal of 55812921648 is 84612921855.

It is a self number, because there is not a number n which added to its sum of digits gives 55812921648.

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, 90458236 + ... + 90458852.

It is an arithmetic number, because the mean of its divisors is an integer number (529680384).

Almost surely, 2^55812921648 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 55812921648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84748861440).

55812921648 is an abundant number, since it is smaller than the sum of its proper divisors (113684801232).

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

55812921648 is a wasteful number, since it uses less digits than its factorization.

55812921648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856 (or 850 counting only the distinct ones).

The product of its digits is 1382400, while the sum is 51.

The spelling of 55812921648 in words is "fifty-five billion, eight hundred twelve million, nine hundred twenty-one thousand, six hundred forty-eight".