18708668873 has 2 divisors, whose sum is σ = 18708668874. Its totient is φ = 18708668872.

The previous prime is 18708668851. The next prime is 18708668879. The reversal of 18708668873 is 37886680781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16991643904 + 1717024969 = 130352^2 + 41437^2 .

It is an emirp because it is prime and its reverse (37886680781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18708668873 is a prime.

It is not a weakly prime, because it can be changed into another prime (18708668879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9354334436 + 9354334437.

It is an arithmetic number, because the mean of its divisors is an integer number (9354334437).

Almost surely, 2^18708668873 is an apocalyptic number.

It is an amenable number.

18708668873 is a deficient number, since it is larger than the sum of its proper divisors (1).

18708668873 is an equidigital number, since it uses as much as digits as its factorization.

18708668873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21676032, while the sum is 62.

The spelling of 18708668873 in words is "eighteen billion, seven hundred eight million, six hundred sixty-eight thousand, eight hundred seventy-three".