55521801216000 has 3360 divisors, whose sum is σ = 253828712966400. Its totient is φ = 12006044467200.

The previous prime is 55521801215999. The next prime is 55521801216053. The reversal of 55521801216000 is 61210812555.

55521801216000 is a `hidden beast` number, since 5 + 5 + 5 + 21 + 8 + 0 + 1 + 21 + 600 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (3360).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 77220863641 + ... + 77220864359.

Almost surely, 2^{55521801216000} is an apocalyptic number.

55521801216000 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 55521801216000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126914356483200).

55521801216000 is an abundant number, since it is smaller than the sum of its proper divisors (198306911750400).

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

55521801216000 is an equidigital number, since it uses as much as digits as its factorization.

55521801216000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 755 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The spelling of 55521801216000 in words is "fifty-five trillion, five hundred twenty-one billion, eight hundred one million, two hundred sixteen thousand".