55662821568 has 140 divisors (see below), whose sum is σ = 165150378360. Its totient is φ = 18537596928.

The previous prime is 55662821453. The next prime is 55662821587. The reversal of 55662821568 is 86512826655.

It is a happy number.

55662821568 is a `hidden beast` number, since 5 + 5 + 6 + 628 + 2 + 1 + 5 + 6 + 8 = 666.

It is a super-2 number, since 2×55662821568² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6646888 + ... + 6655256.

Almost surely, 2^55662821568 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 55662821568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82575189180).

55662821568 is an abundant number, since it is smaller than the sum of its proper divisors (109487556792).

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

55662821568 is a wasteful number, since it uses less digits than its factorization.

55662821568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9676 (or 9657 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 54.

The spelling of 55662821568 in words is "fifty-five billion, six hundred sixty-two million, eight hundred twenty-one thousand, five hundred sixty-eight".