18659064965 has 4 divisors (see below), whose sum is σ = 22390877964. Its totient is φ = 14927251968.

The previous prime is 18659064959. The next prime is 18659064989. The reversal of 18659064965 is 56946095681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56946095681 = 25969 ⋅2192849.

It can be written as a sum of positive squares in 2 ways, for example, as 13943358724 + 4715706241 = 118082^2 + 68671^2 .

It is a cyclic number.

It is not a de Polignac number, because 18659064965 - 2²⁴ = 18642287749 is a prime.

It is a Duffinian number.

It is a congruent 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, 1865906492 + ... + 1865906501.

It is an arithmetic number, because the mean of its divisors is an integer number (5597719491).

Almost surely, 2^18659064965 is an apocalyptic number.

It is an amenable number.

18659064965 is a deficient number, since it is larger than the sum of its proper divisors (3731812999).

18659064965 is an equidigital number, since it uses as much as digits as its factorization.

18659064965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3731812998.

The product of its (nonzero) digits is 13996800, while the sum is 59.

The spelling of 18659064965 in words is "eighteen billion, six hundred fifty-nine million, sixty-four thousand, nine hundred sixty-five".