55421655168 has 384 divisors, whose sum is σ = 169043212800. Its totient is φ = 16057958400.

The previous prime is 55421655139. The next prime is 55421655187. The reversal of 55421655168 is 86155612455.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×55421655168² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157001680 + ... + 157002032.

It is an arithmetic number, because the mean of its divisors is an integer number (440216700).

Almost surely, 2^55421655168 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 55421655168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84521606400).

55421655168 is an abundant number, since it is smaller than the sum of its proper divisors (113621557632).

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

55421655168 is a wasteful number, since it uses less digits than its factorization.

55421655168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532 (or 509 counting only the distinct ones).

The product of its digits is 1440000, while the sum is 48.

The spelling of 55421655168 in words is "fifty-five billion, four hundred twenty-one million, six hundred fifty-five thousand, one hundred sixty-eight".