18684380399 has 2 divisors, whose sum is σ = 18684380400. Its totient is φ = 18684380398.

The previous prime is 18684380317. The next prime is 18684380413. The reversal of 18684380399 is 99308348681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18684380399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18684380699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9342190199 + 9342190200.

It is an arithmetic number, because the mean of its divisors is an integer number (9342190200).

Almost surely, 2^18684380399 is an apocalyptic number.

18684380399 is a deficient number, since it is larger than the sum of its proper divisors (1).

18684380399 is an equidigital number, since it uses as much as digits as its factorization.

18684380399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8957952, while the sum is 59.

The spelling of 18684380399 in words is "eighteen billion, six hundred eighty-four million, three hundred eighty thousand, three hundred ninety-nine".