18025809983999 has 4 divisors (see below), whose sum is σ = 18027266862936. Its totient is φ = 18024353105064.

The previous prime is 18025809983969. The next prime is 18025809984001. The reversal of 18025809983999 is 99938990852081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18025809983999 - 2²⁰ = 18025808935423 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 (18025809983939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728420909 + ... + 728445654.

It is an arithmetic number, because the mean of its divisors is an integer number (4506816715734).

Almost surely, 2^{18025809983999} is an apocalyptic number.

18025809983999 is a deficient number, since it is larger than the sum of its proper divisors (1456878937).

18025809983999 is a wasteful number, since it uses less digits than its factorization.

18025809983999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456878936.

The product of its (nonzero) digits is 906992640, while the sum is 80.

The spelling of 18025809983999 in words is "eighteen trillion, twenty-five billion, eight hundred nine million, nine hundred eighty-three thousand, nine hundred ninety-nine".