18217991706 has 16 divisors (see below), whose sum is σ = 36440671584. Its totient is φ = 6071882544.

The previous prime is 18217991689. The next prime is 18217991833. The reversal of 18217991706 is 60719971281.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143776 + ... + 238971.

It is an arithmetic number, because the mean of its divisors is an integer number (2277541974).

Almost surely, 2^18217991706 is an apocalyptic number.

18217991706 is an abundant number, since it is smaller than the sum of its proper divisors (18222679878).

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

18217991706 is a wasteful number, since it uses less digits than its factorization.

18217991706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390685.

The product of its (nonzero) digits is 381024, while the sum is 51.

The spelling of 18217991706 in words is "eighteen billion, two hundred seventeen million, nine hundred ninety-one thousand, seven hundred six".