18399807479 has 2 divisors, whose sum is σ = 18399807480. Its totient is φ = 18399807478.

The previous prime is 18399807473. The next prime is 18399807527. The reversal of 18399807479 is 97470899381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18399807479 - 2⁴ = 18399807463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18399807473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199903739 + 9199903740.

It is an arithmetic number, because the mean of its divisors is an integer number (9199903740).

Almost surely, 2^18399807479 is an apocalyptic number.

18399807479 is a deficient number, since it is larger than the sum of its proper divisors (1).

18399807479 is an equidigital number, since it uses as much as digits as its factorization.

18399807479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 65.

The spelling of 18399807479 in words is "eighteen billion, three hundred ninety-nine million, eight hundred seven thousand, four hundred seventy-nine".