18372909111 has 4 divisors (see below), whose sum is σ = 24497212152. Its totient is φ = 12248606072.

The previous prime is 18372909083. The next prime is 18372909119. The reversal of 18372909111 is 11190927381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11190927381 = 3 ⋅3730309127.

It is a cyclic number.

It is not a de Polignac number, because 18372909111 - 2¹³ = 18372900919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18372909119) 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, 3062151516 + ... + 3062151521.

It is an arithmetic number, because the mean of its divisors is an integer number (6124303038).

Almost surely, 2^18372909111 is an apocalyptic number.

18372909111 is a deficient number, since it is larger than the sum of its proper divisors (6124303041).

18372909111 is an equidigital number, since it uses as much as digits as its factorization.

18372909111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6124303040.

The product of its (nonzero) digits is 27216, while the sum is 42.

The spelling of 18372909111 in words is "eighteen billion, three hundred seventy-two million, nine hundred nine thousand, one hundred eleven".