55621630566 has 36 divisors (see below), whose sum is σ = 121328648532. Its totient is φ = 18415978032.

The previous prime is 55621630553. The next prime is 55621630573. The reversal of 55621630566 is 66503612655.

55621630566 is a `hidden beast` number, since 5 + 5 + 6 + 2 + 1 + 630 + 5 + 6 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 330025 + ... + 469211.

It is an arithmetic number, because the mean of its divisors is an integer number (3370240237).

Almost surely, 2^55621630566 is an apocalyptic number.

55621630566 is an abundant number, since it is smaller than the sum of its proper divisors (65707017966).

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

55621630566 is a wasteful number, since it uses less digits than its factorization.

55621630566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139493 (or 139341 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The spelling of 55621630566 in words is "fifty-five billion, six hundred twenty-one million, six hundred thirty thousand, five hundred sixty-six".