18038459999 has 16 divisors (see below), whose sum is σ = 21464417856. Its totient is φ = 14837126400.

The previous prime is 18038459963. The next prime is 18038460001. The reversal of 18038459999 is 99995483081.

It is a cyclic number.

It is not a de Polignac number, because 18038459999 - 2¹⁶ = 18038394463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038459599) 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, 497672 + ... + 532685.

It is an arithmetic number, because the mean of its divisors is an integer number (1341526116).

Almost surely, 2^18038459999 is an apocalyptic number.

18038459999 is a deficient number, since it is larger than the sum of its proper divisors (3425957857).

18038459999 is a wasteful number, since it uses less digits than its factorization.

18038459999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030466.

The product of its (nonzero) digits is 25194240, while the sum is 65.

The spelling of 18038459999 in words is "eighteen billion, thirty-eight million, four hundred fifty-nine thousand, nine hundred ninety-nine".