18446399999 has 8 divisors (see below), whose sum is σ = 18839323440. Its totient is φ = 18055138816.

The previous prime is 18446399833. The next prime is 18446400013. The reversal of 18446399999 is 99999364481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18446399999 - 2³² = 14151432703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18446392999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393122 + ... + 437535.

It is an arithmetic number, because the mean of its divisors is an integer number (2354915430).

Almost surely, 2^18446399999 is an apocalyptic number.

18446399999 is a deficient number, since it is larger than the sum of its proper divisors (392923441).

18446399999 is an equidigital number, since it uses as much as digits as its factorization.

18446399999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831129.

The product of its digits is 136048896, while the sum is 71.

The spelling of 18446399999 in words is "eighteen billion, four hundred forty-six million, three hundred ninety-nine thousand, nine hundred ninety-nine".