18111499201 has 4 divisors (see below), whose sum is σ = 18898955712. Its totient is φ = 17324042692.

The previous prime is 18111499193. The next prime is 18111499243. The reversal of 18111499201 is 10299411181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10299411181 = 727 ⋅14167003.

It is a cyclic number.

It is not a de Polignac number, because 18111499201 - 2³ = 18111499193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18111499261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 393728221 + ... + 393728266.

It is an arithmetic number, because the mean of its divisors is an integer number (4724738928).

Almost surely, 2^18111499201 is an apocalyptic number.

It is an amenable number.

18111499201 is a deficient number, since it is larger than the sum of its proper divisors (787456511).

18111499201 is an equidigital number, since it uses as much as digits as its factorization.

18111499201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787456510.

The product of its (nonzero) digits is 5184, while the sum is 37.

The spelling of 18111499201 in words is "eighteen billion, one hundred eleven million, four hundred ninety-nine thousand, two hundred one".