18866850018 has 16 divisors (see below), whose sum is σ = 38188323936. Its totient is φ = 6213179360.

The previous prime is 18866850017. The next prime is 18866850043. The reversal of 18866850018 is 81005866881.

It is not an unprimeable number, because it can be changed into a prime (18866850017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18942123 + ... + 18943118.

It is an arithmetic number, because the mean of its divisors is an integer number (2386770246).

Almost surely, 2^18866850018 is an apocalyptic number.

18866850018 is an abundant number, since it is smaller than the sum of its proper divisors (19321473918).

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

18866850018 is a wasteful number, since it uses less digits than its factorization.

18866850018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37885329.

The product of its (nonzero) digits is 737280, while the sum is 51.

The spelling of 18866850018 in words is "eighteen billion, eight hundred sixty-six million, eight hundred fifty thousand, eighteen".