18684399373 has 2 divisors, whose sum is σ = 18684399374. Its totient is φ = 18684399372.

The previous prime is 18684399289. The next prime is 18684399397. The reversal of 18684399373 is 37399348681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18671309449 + 13089924 = 136643^2 + 3618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18684399373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18684399073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342199686 + 9342199687.

It is an arithmetic number, because the mean of its divisors is an integer number (9342199687).

Almost surely, 2^18684399373 is an apocalyptic number.

It is an amenable number.

18684399373 is a deficient number, since it is larger than the sum of its proper divisors (1).

18684399373 is an equidigital number, since it uses as much as digits as its factorization.

18684399373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23514624, while the sum is 61.

The spelling of 18684399373 in words is "eighteen billion, six hundred eighty-four million, three hundred ninety-nine thousand, three hundred seventy-three".