18473509399 has 2 divisors, whose sum is σ = 18473509400. Its totient is φ = 18473509398.

The previous prime is 18473509331. The next prime is 18473509421. The reversal of 18473509399 is 99390537481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18473509399 - 2¹⁷ = 18473378327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18473549399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9236754699 + 9236754700.

It is an arithmetic number, because the mean of its divisors is an integer number (9236754700).

Almost surely, 2^18473509399 is an apocalyptic number.

18473509399 is a deficient number, since it is larger than the sum of its proper divisors (1).

18473509399 is an equidigital number, since it uses as much as digits as its factorization.

18473509399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 58.

The spelling of 18473509399 in words is "eighteen billion, four hundred seventy-three million, five hundred nine thousand, three hundred ninety-nine".