18668683273 has 2 divisors, whose sum is σ = 18668683274. Its totient is φ = 18668683272.

The previous prime is 18668683261. The next prime is 18668683277. The reversal of 18668683273 is 37238686681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17764358089 + 904325184 = 133283^2 + 30072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18668683273 is a prime.

It is not a weakly prime, because it can be changed into another prime (18668683277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9334341636 + 9334341637.

It is an arithmetic number, because the mean of its divisors is an integer number (9334341637).

Almost surely, 2^18668683273 is an apocalyptic number.

It is an amenable number.

18668683273 is a deficient number, since it is larger than the sum of its proper divisors (1).

18668683273 is an equidigital number, since it uses as much as digits as its factorization.

18668683273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 58.

The spelling of 18668683273 in words is "eighteen billion, six hundred sixty-eight million, six hundred eighty-three thousand, two hundred seventy-three".