18555172142 has 16 divisors (see below), whose sum is σ = 30151106160. Its totient is φ = 8563923576.

The previous prime is 18555172123. The next prime is 18555172157. The reversal of 18555172142 is 24127155581.

It is a self number, because there is not a number n which added to its sum of digits gives 18555172142.

It is a congruent number.

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, 2107028 + ... + 2115815.

It is an arithmetic number, because the mean of its divisors is an integer number (1884444135).

Almost surely, 2^18555172142 is an apocalyptic number.

18555172142 is a deficient number, since it is larger than the sum of its proper divisors (11595934018).

18555172142 is an equidigital number, since it uses as much as digits as its factorization.

18555172142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222884 (or 4222858 counting only the distinct ones).

The product of its digits is 112000, while the sum is 41.

The spelling of 18555172142 in words is "eighteen billion, five hundred fifty-five million, one hundred seventy-two thousand, one hundred forty-two".