18251912099 has 4 divisors (see below), whose sum is σ = 18252227760. Its totient is φ = 18251596440.

The previous prime is 18251912093. The next prime is 18251912111. The reversal of 18251912099 is 99021915281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18251912099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18251912093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43484 + ... + 195945.

It is an arithmetic number, because the mean of its divisors is an integer number (4563056940).

Almost surely, 2^18251912099 is an apocalyptic number.

18251912099 is a deficient number, since it is larger than the sum of its proper divisors (315661).

18251912099 is an equidigital number, since it uses as much as digits as its factorization.

18251912099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315660.

The product of its (nonzero) digits is 116640, while the sum is 47.

The spelling of 18251912099 in words is "eighteen billion, two hundred fifty-one million, nine hundred twelve thousand, ninety-nine".