55561604004 has 72 divisors (see below), whose sum is σ = 140935616640. Its totient is φ = 18456265152.

The previous prime is 55561603963. The next prime is 55561604027. The reversal of 55561604004 is 40040616555.

55561604004 is a `hidden beast` number, since 5 + 556 + 1 + 60 + 40 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 55561604004.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17812357 + ... + 17815475.

It is an arithmetic number, because the mean of its divisors is an integer number (1957439120).

Almost surely, 2^55561604004 is an apocalyptic number.

It is an amenable number.

55561604004 is an abundant number, since it is smaller than the sum of its proper divisors (85374012636).

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

55561604004 is a wasteful number, since it uses less digits than its factorization.

55561604004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4689 (or 4684 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

It can be divided in two parts, 5556160 and 4004, that added together give a square (5560164 = 2358²).

The spelling of 55561604004 in words is "fifty-five billion, five hundred sixty-one million, six hundred four thousand, four".