18716874997 has 2 divisors, whose sum is σ = 18716874998. Its totient is φ = 18716874996.

The previous prime is 18716874983. The next prime is 18716875043. The reversal of 18716874997 is 79947861781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16462429636 + 2254445361 = 128306^2 + 47481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18716874997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18716874937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9358437498 + 9358437499.

It is an arithmetic number, because the mean of its divisors is an integer number (9358437499).

Almost surely, 2^18716874997 is an apocalyptic number.

It is an amenable number.

18716874997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18716874997 is an equidigital number, since it uses as much as digits as its factorization.

18716874997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42674688, while the sum is 67.

The spelling of 18716874997 in words is "eighteen billion, seven hundred sixteen million, eight hundred seventy-four thousand, nine hundred ninety-seven".