18440716999 has 2 divisors, whose sum is σ = 18440717000. Its totient is φ = 18440716998.

The previous prime is 18440716991. The next prime is 18440717033. The reversal of 18440716999 is 99961704481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18440716999 - 2³ = 18440716991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18440716991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9220358499 + 9220358500.

It is an arithmetic number, because the mean of its divisors is an integer number (9220358500).

Almost surely, 2^18440716999 is an apocalyptic number.

18440716999 is a deficient number, since it is larger than the sum of its proper divisors (1).

18440716999 is an equidigital number, since it uses as much as digits as its factorization.

18440716999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3919104, while the sum is 58.

The spelling of 18440716999 in words is "eighteen billion, four hundred forty million, seven hundred sixteen thousand, nine hundred ninety-nine".