18207572317 has 8 divisors (see below), whose sum is σ = 20726406720. Its totient is φ = 15832671360.

The previous prime is 18207572291. The next prime is 18207572323. The reversal of 18207572317 is 71327570281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18207572317 - 2⁷ = 18207572189 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 (18207572417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35983092 + ... + 35983597.

It is an arithmetic number, because the mean of its divisors is an integer number (2590800840).

Almost surely, 2^18207572317 is an apocalyptic number.

It is an amenable number.

18207572317 is a deficient number, since it is larger than the sum of its proper divisors (2518834403).

18207572317 is a wasteful number, since it uses less digits than its factorization.

18207572317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71966723.

The product of its (nonzero) digits is 164640, while the sum is 43.

The spelling of 18207572317 in words is "eighteen billion, two hundred seven million, five hundred seventy-two thousand, three hundred seventeen".