18259642999 has 16 divisors (see below), whose sum is σ = 20828949120. Its totient is φ = 15857487360.

The previous prime is 18259642997. The next prime is 18259643047. The reversal of 18259642999 is 99924695281.

It is not a de Polignac number, because 18259642999 - 2¹ = 18259642997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18259642999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18259642997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 617842 + ... + 646720.

It is an arithmetic number, because the mean of its divisors is an integer number (1301809320).

Almost surely, 2^18259642999 is an apocalyptic number.

18259642999 is a deficient number, since it is larger than the sum of its proper divisors (2569306121).

18259642999 is a wasteful number, since it uses less digits than its factorization.

18259642999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31770.

The product of its digits is 25194240, while the sum is 64.

The spelling of 18259642999 in words is "eighteen billion, two hundred fifty-nine million, six hundred forty-two thousand, nine hundred ninety-nine".