18390072099 has 32 divisors (see below), whose sum is σ = 29684067840. Its totient is φ = 9886228992.

The previous prime is 18390072079. The next prime is 18390072109. The reversal of 18390072099 is 99027009381.

It is a Cunningham number, because it is equal to 135610²-1.

It is not a de Polignac number, because 18390072099 - 2²¹ = 18387974947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18390072079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 939577 + ... + 958949.

It is an arithmetic number, because the mean of its divisors is an integer number (927627120).

Almost surely, 2^18390072099 is an apocalyptic number.

18390072099 is a deficient number, since it is larger than the sum of its proper divisors (11293995741).

18390072099 is a wasteful number, since it uses less digits than its factorization.

18390072099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22059.

The product of its (nonzero) digits is 244944, while the sum is 48.

The spelling of 18390072099 in words is "eighteen billion, three hundred ninety million, seventy-two thousand, ninety-nine".