18751687873 has 2 divisors, whose sum is σ = 18751687874. Its totient is φ = 18751687872.

The previous prime is 18751687861. The next prime is 18751687891. The reversal of 18751687873 is 37878615781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13565959729 + 5185728144 = 116473^2 + 72012^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18751687873 is a prime.

It is not a weakly prime, because it can be changed into another prime (18751687853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375843936 + 9375843937.

It is an arithmetic number, because the mean of its divisors is an integer number (9375843937).

Almost surely, 2^18751687873 is an apocalyptic number.

It is an amenable number.

18751687873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18751687873 is an equidigital number, since it uses as much as digits as its factorization.

18751687873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15805440, while the sum is 61.

The spelling of 18751687873 in words is "eighteen billion, seven hundred fifty-one million, six hundred eighty-seven thousand, eight hundred seventy-three".