18065421864 has 96 divisors (see below), whose sum is σ = 57720599040. Its totient is φ = 4995043200.

The previous prime is 18065421839. The next prime is 18065421883. The reversal of 18065421864 is 46812456081.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 562507 + ... + 593754.

It is an arithmetic number, because the mean of its divisors is an integer number (601256240).

Almost surely, 2^18065421864 is an apocalyptic number.

18065421864 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18065421864 is an abundant number, since it is smaller than the sum of its proper divisors (39655177176).

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

18065421864 is a wasteful number, since it uses less digits than its factorization.

18065421864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156311 (or 1156304 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 18065421864 in words is "eighteen billion, sixty-five million, four hundred twenty-one thousand, eight hundred sixty-four".