18550385898 has 32 divisors (see below), whose sum is σ = 40486666752. Its totient is φ = 5619510000.

The previous prime is 18550385879. The next prime is 18550385923. The reversal of 18550385898 is 89858305581.

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, 167523 + ... + 255273.

It is an arithmetic number, because the mean of its divisors is an integer number (1265208336).

Almost surely, 2^18550385898 is an apocalyptic number.

18550385898 is an abundant number, since it is smaller than the sum of its proper divisors (21936280854).

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

18550385898 is a wasteful number, since it uses less digits than its factorization.

18550385898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90970.

The product of its (nonzero) digits is 13824000, while the sum is 60.

The spelling of 18550385898 in words is "eighteen billion, five hundred fifty million, three hundred eighty-five thousand, eight hundred ninety-eight".