18550855266 has 64 divisors (see below), whose sum is σ = 38630338560. Its totient is φ = 5932543680.

The previous prime is 18550855249. The next prime is 18550855291. The reversal of 18550855266 is 66255805581.

It is a super-2 number, since 2×18550855266² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12714045 + ... + 12715503.

It is an arithmetic number, because the mean of its divisors is an integer number (603599040).

Almost surely, 2^18550855266 is an apocalyptic number.

18550855266 is an abundant number, since it is smaller than the sum of its proper divisors (20079483294).

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

18550855266 is a wasteful number, since it uses less digits than its factorization.

18550855266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039.

The product of its (nonzero) digits is 2880000, while the sum is 51.

The spelling of 18550855266 in words is "eighteen billion, five hundred fifty million, eight hundred fifty-five thousand, two hundred sixty-six".