18502440799 has 4 divisors (see below), whose sum is σ = 19099293760. Its totient is φ = 17905587840.

The previous prime is 18502440797. The next prime is 18502440809. The reversal of 18502440799 is 99704420581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99704420581 = 101 ⋅987172481.

It is a cyclic number.

It is not a de Polignac number, because 18502440799 - 2¹ = 18502440797 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 (18502440797) 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, 298426434 + ... + 298426495.

It is an arithmetic number, because the mean of its divisors is an integer number (4774823440).

Almost surely, 2^18502440799 is an apocalyptic number.

18502440799 is a deficient number, since it is larger than the sum of its proper divisors (596852961).

18502440799 is an equidigital number, since it uses as much as digits as its factorization.

18502440799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596852960.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 18502440799 in words is "eighteen billion, five hundred two million, four hundred forty thousand, seven hundred ninety-nine".