18668355073 has 2 divisors, whose sum is σ = 18668355074. Its totient is φ = 18668355072.

The previous prime is 18668355011. The next prime is 18668355113. The reversal of 18668355073 is 37055386681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14407921089 + 4260433984 = 120033^2 + 65272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18668355073 is a prime.

It is a super-2 number, since 2×18668355073² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18668355073.

It is not a weakly prime, because it can be changed into another prime (18668355373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9334177536 + 9334177537.

It is an arithmetic number, because the mean of its divisors is an integer number (9334177537).

Almost surely, 2^18668355073 is an apocalyptic number.

It is an amenable number.

18668355073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18668355073 is an equidigital number, since it uses as much as digits as its factorization.

18668355073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 52.

The spelling of 18668355073 in words is "eighteen billion, six hundred sixty-eight million, three hundred fifty-five thousand, seventy-three".