18906814317 has 4 divisors (see below), whose sum is σ = 25209085760. Its totient is φ = 12604542876.

The previous prime is 18906814313. The next prime is 18906814331. The reversal of 18906814317 is 71341860981.

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 not a de Polignac number, because 18906814317 - 2² = 18906814313 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18906814313) 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, 3151135717 + ... + 3151135722.

It is an arithmetic number, because the mean of its divisors is an integer number (6302271440).

Almost surely, 2^18906814317 is an apocalyptic number.

It is an amenable number.

18906814317 is a deficient number, since it is larger than the sum of its proper divisors (6302271443).

18906814317 is an equidigital number, since it uses as much as digits as its factorization.

18906814317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6302271442.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 18906814317 in words is "eighteen billion, nine hundred six million, eight hundred fourteen thousand, three hundred seventeen".