18751045985317 has 2 divisors, whose sum is σ = 18751045985318. Its totient is φ = 18751045985316.

The previous prime is 18751045985251. The next prime is 18751045985339. The reversal of 18751045985317 is 71358954015781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16736616463681 + 2014429521636 = 4091041^2 + 1419306^2 .

It is a cyclic number.

It is not a de Polignac number, because 18751045985317 - 2³⁵ = 18716686246949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18751045985417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375522992658 + 9375522992659.

It is an arithmetic number, because the mean of its divisors is an integer number (9375522992659).

Almost surely, 2^{18751045985317} is an apocalyptic number.

It is an amenable number.

18751045985317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18751045985317 is an equidigital number, since it uses as much as digits as its factorization.

18751045985317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336000, while the sum is 64.

The spelling of 18751045985317 in words is "eighteen trillion, seven hundred fifty-one billion, forty-five million, nine hundred eighty-five thousand, three hundred seventeen".