18312586465 has 4 divisors (see below), whose sum is σ = 21975103764. Its totient is φ = 14650069168.

The previous prime is 18312586459. The next prime is 18312586469. The reversal of 18312586465 is 56468521381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56468521381 = 431 ⋅131017451.

It can be written as a sum of positive squares in 2 ways, for example, as 5801716561 + 12510869904 = 76169^2 + 111852^2 .

It is a cyclic number.

It is not a de Polignac number, because 18312586465 - 2¹⁷ = 18312455393 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18312586469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831258642 + ... + 1831258651.

It is an arithmetic number, because the mean of its divisors is an integer number (5493775941).

Almost surely, 2^18312586465 is an apocalyptic number.

It is an amenable number.

18312586465 is a deficient number, since it is larger than the sum of its proper divisors (3662517299).

18312586465 is an equidigital number, since it uses as much as digits as its factorization.

18312586465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662517298.

The product of its digits is 1382400, while the sum is 49.

The spelling of 18312586465 in words is "eighteen billion, three hundred twelve million, five hundred eighty-six thousand, four hundred sixty-five".