55561566520 has 64 divisors (see below), whose sum is σ = 129663828000. Its totient is φ = 21409804800.

The previous prime is 55561566517. The next prime is 55561566521. The reversal of 55561566520 is 2566516555.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561566521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36370 + ... + 335329.

Almost surely, 2^55561566520 is an apocalyptic number.

It is an amenable number.

55561566520 is an abundant number, since it is smaller than the sum of its proper divisors (74102261480).

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

55561566520 is a wasteful number, since it uses less digits than its factorization.

55561566520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371848 (or 371844 counting only the distinct ones).

The product of its (nonzero) digits is 1350000, while the sum is 46.

The spelling of 55561566520 in words is "fifty-five billion, five hundred sixty-one million, five hundred sixty-six thousand, five hundred twenty".