18320064985 has 4 divisors (see below), whose sum is σ = 21984077988. Its totient is φ = 14656051984.

The previous prime is 18320064941. The next prime is 18320065021. The reversal of 18320064985 is 58946002381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6959063241 + 11361001744 = 83421^2 + 106588^2 .

It is a cyclic number.

It is not a de Polignac number, because 18320064985 - 2¹³ = 18320056793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1832006494 + ... + 1832006503.

It is an arithmetic number, because the mean of its divisors is an integer number (5496019497).

Almost surely, 2^18320064985 is an apocalyptic number.

It is an amenable number.

18320064985 is a deficient number, since it is larger than the sum of its proper divisors (3664013003).

18320064985 is an equidigital number, since it uses as much as digits as its factorization.

18320064985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664013002.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 18320064985 in words is "eighteen billion, three hundred twenty million, sixty-four thousand, nine hundred eighty-five".