55621620168 has 16 divisors (see below), whose sum is σ = 139054050480. Its totient is φ = 18540540048.

The previous prime is 55621620127. The next prime is 55621620191. The reversal of 55621620168 is 86102612655.

55621620168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55621620168² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1158783730 + ... + 1158783777.

It is an arithmetic number, because the mean of its divisors is an integer number (8690878155).

Almost surely, 2^55621620168 is an apocalyptic number.

It is an amenable number.

55621620168 is an abundant number, since it is smaller than the sum of its proper divisors (83432430312).

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

55621620168 is a wasteful number, since it uses less digits than its factorization.

55621620168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2317567516 (or 2317567512 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 55621620168 in words is "fifty-five billion, six hundred twenty-one million, six hundred twenty thousand, one hundred sixty-eight".