55921624560 has 160 divisors (see below), whose sum is σ = 192744360000. Its totient is φ = 14902723584.

The previous prime is 55921624547. The next prime is 55921624601. The reversal of 55921624560 is 6542612955.

55921624560 is a `hidden beast` number, since 5 + 5 + 9 + 21 + 62 + 4 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3683866 + ... + 3699014.

It is an arithmetic number, because the mean of its divisors is an integer number (1204652250).

Almost surely, 2^55921624560 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 55921624560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96372180000).

55921624560 is an abundant number, since it is smaller than the sum of its proper divisors (136822735440).

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

55921624560 is a wasteful number, since it uses less digits than its factorization.

55921624560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16880 (or 16868 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 55921624560 in words is "fifty-five billion, nine hundred twenty-one million, six hundred twenty-four thousand, five hundred sixty".