55554999980 has 24 divisors (see below), whose sum is σ = 116699295888. Its totient is φ = 22215562688.

The previous prime is 55554999979. The next prime is 55555000021. The reversal of 55554999980 is 8999945555.

It is a self number, because there is not a number n which added to its sum of digits gives 55554999980.

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, 331259 + ... + 469938.

It is an arithmetic number, because the mean of its divisors is an integer number (4862470662).

Almost surely, 2^55554999980 is an apocalyptic number.

It is an amenable number.

55554999980 is an abundant number, since it is smaller than the sum of its proper divisors (61144295908).

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

55554999980 is a wasteful number, since it uses less digits than its factorization.

55554999980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804673 (or 804671 counting only the distinct ones).

The product of its (nonzero) digits is 131220000, while the sum is 68.

The spelling of 55554999980 in words is "fifty-five billion, five hundred fifty-four million, nine hundred ninety-nine thousand, nine hundred eighty".