55821491712 has 640 divisors, whose sum is σ = 201470438400. Its totient is φ = 14906032128.

The previous prime is 55821491701. The next prime is 55821491743. The reversal of 55821491712 is 21719412855.

55821491712 is a `hidden beast` number, since 5 + 582 + 1 + 49 + 17 + 12 = 666.

55821491712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 178343268 + ... + 178343580.

It is an arithmetic number, because the mean of its divisors is an integer number (314797560).

Almost surely, 2^55821491712 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 55821491712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100735219200).

55821491712 is an abundant number, since it is smaller than the sum of its proper divisors (145648946688).

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

55821491712 is a wasteful number, since it uses less digits than its factorization.

55821491712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463 (or 441 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The spelling of 55821491712 in words is "fifty-five billion, eight hundred twenty-one million, four hundred ninety-one thousand, seven hundred twelve".