55561115560 has 128 divisors (see below), whose sum is σ = 137016230400. Its totient is φ = 20203776000.

The previous prime is 55561115537. The next prime is 55561115639. The reversal of 55561115560 is 6551116555.

It is a super-2 number, since 2×55561115560² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1886145 + ... + 1915375.

It is an arithmetic number, because the mean of its divisors is an integer number (1070439300).

Almost surely, 2^55561115560 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 55561115560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68508115200).

55561115560 is an abundant number, since it is smaller than the sum of its proper divisors (81455114840).

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

55561115560 is a wasteful number, since it uses less digits than its factorization.

55561115560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29363 (or 29359 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 55561115560 in words is "fifty-five billion, five hundred sixty-one million, one hundred fifteen thousand, five hundred sixty".