55558945818 has 16 divisors (see below), whose sum is σ = 123464324160. Its totient is φ = 18519648588.

The previous prime is 55558945807. The next prime is 55558945867. The reversal of 55558945818 is 81854985555.

55558945818 is a `hidden beast` number, since 5 + 5 + 5 + 589 + 45 + 8 + 1 + 8 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514434630 + ... + 514434737.

It is an arithmetic number, because the mean of its divisors is an integer number (7716520260).

Almost surely, 2^55558945818 is an apocalyptic number.

55558945818 is an abundant number, since it is smaller than the sum of its proper divisors (67905378342).

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

55558945818 is a wasteful number, since it uses less digits than its factorization.

55558945818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1028869378 (or 1028869372 counting only the distinct ones).

The product of its digits is 57600000, while the sum is 63.

The spelling of 55558945818 in words is "fifty-five billion, five hundred fifty-eight million, nine hundred forty-five thousand, eight hundred eighteen".