18240353999 has 16 divisors (see below), whose sum is σ = 21141979968. Its totient is φ = 15412902912.

The previous prime is 18240353981. The next prime is 18240354007. The reversal of 18240353999 is 99935304281.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18240353999 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 18240353999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240353899) 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, 1207139 + ... + 1222155.

It is an arithmetic number, because the mean of its divisors is an integer number (1321373748).

Almost surely, 2^18240353999 is an apocalyptic number.

18240353999 is a deficient number, since it is larger than the sum of its proper divisors (2901625969).

18240353999 is a wasteful number, since it uses less digits than its factorization.

18240353999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17474.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 18240353999 in words is "eighteen billion, two hundred forty million, three hundred fifty-three thousand, nine hundred ninety-nine".