18315233641 has 4 divisors (see below), whose sum is σ = 18318943872. Its totient is φ = 18311523412.

The previous prime is 18315233621. The next prime is 18315233663. The reversal of 18315233641 is 14633251381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18315233641 - 2⁵ = 18315233609 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18315233641.

It is not an unprimeable number, because it can be changed into a prime (18315233621) 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, 1847701 + ... + 1857586.

It is an arithmetic number, because the mean of its divisors is an integer number (4579735968).

Almost surely, 2^18315233641 is an apocalyptic number.

It is an amenable number.

18315233641 is a deficient number, since it is larger than the sum of its proper divisors (3710231).

18315233641 is an equidigital number, since it uses as much as digits as its factorization.

18315233641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3710230.

The product of its digits is 51840, while the sum is 37.

The spelling of 18315233641 in words is "eighteen billion, three hundred fifteen million, two hundred thirty-three thousand, six hundred forty-one".