18855218855 has 16 divisors (see below), whose sum is σ = 24887197728. Its totient is φ = 13712881600.

The previous prime is 18855218839. The next prime is 18855218881. The reversal of 18855218855 is 55881255881.

It is a happy number.

It is not a de Polignac number, because 18855218855 - 2⁴ = 18855218839 is a prime.

It is a super-2 number, since 2×18855218855² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18855218855.

It is a congruent number.

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, 1409966 + ... + 1423275.

It is an arithmetic number, because the mean of its divisors is an integer number (1555449858).

Almost surely, 2^18855218855 is an apocalyptic number.

18855218855 is a deficient number, since it is larger than the sum of its proper divisors (6031978873).

18855218855 is an equidigital number, since it uses as much as digits as its factorization.

18855218855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2833279 (or 2833257 counting only the distinct ones).

The product of its digits is 5120000, while the sum is 56.

The spelling of 18855218855 in words is "eighteen billion, eight hundred fifty-five million, two hundred eighteen thousand, eight hundred fifty-five".