55561556000 has 96 divisors (see below), whose sum is σ = 136631214720. Its totient is φ = 22205664000.

The previous prime is 55561555981. The next prime is 55561556087. The reversal of 55561556000 is 65516555.

It is a super-2 number, since 2×55561556000² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5270735 + ... + 5281265.

It is an arithmetic number, because the mean of its divisors is an integer number (1423241820).

Almost surely, 2^55561556000 is an apocalyptic number.

55561556000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55561556000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68315607360).

55561556000 is an abundant number, since it is smaller than the sum of its proper divisors (81069658720).

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

55561556000 is a wasteful number, since it uses less digits than its factorization.

55561556000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11875 (or 11857 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 38.

The spelling of 55561556000 in words is "fifty-five billion, five hundred sixty-one million, five hundred fifty-six thousand".