18220642918 has 16 divisors (see below), whose sum is σ = 28724451840. Its totient is φ = 8651525256.

The previous prime is 18220642907. The next prime is 18220642919. The reversal of 18220642918 is 81924602281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18220642919) 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, 1418430 + ... + 1431217.

It is an arithmetic number, because the mean of its divisors is an integer number (1795278240).

Almost surely, 2^18220642918 is an apocalyptic number.

18220642918 is a deficient number, since it is larger than the sum of its proper divisors (10503808922).

18220642918 is a wasteful number, since it uses less digits than its factorization.

18220642918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2849811.

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 18220642918 in words is "eighteen billion, two hundred twenty million, six hundred forty-two thousand, nine hundred eighteen".