18446399833 has 2 divisors, whose sum is σ = 18446399834. Its totient is φ = 18446399832.

The previous prime is 18446399801. The next prime is 18446400013. The reversal of 18446399833 is 33899364481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18372989209 + 73410624 = 135547^2 + 8568^2 .

It is an emirp because it is prime and its reverse (33899364481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18446399833 - 2⁵ = 18446399801 is a prime.

It is not a weakly prime, because it can be changed into another prime (18446399233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9223199916 + 9223199917.

It is an arithmetic number, because the mean of its divisors is an integer number (9223199917).

Almost surely, 2^18446399833 is an apocalyptic number.

It is an amenable number.

18446399833 is a deficient number, since it is larger than the sum of its proper divisors (1).

18446399833 is an equidigital number, since it uses as much as digits as its factorization.

18446399833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 58.

The spelling of 18446399833 in words is "eighteen billion, four hundred forty-six million, three hundred ninety-nine thousand, eight hundred thirty-three".