18133812337 has 4 divisors (see below), whose sum is σ = 18154972836. Its totient is φ = 18112651840.

The previous prime is 18133812313. The next prime is 18133812349. The reversal of 18133812337 is 73321833181.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13028852736 + 5104959601 = 114144^2 + 71449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18133812337 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 18133812337.

It is not an unprimeable number, because it can be changed into a prime (18133822337) 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, 10578964 + ... + 10580677.

It is an arithmetic number, because the mean of its divisors is an integer number (4538743209).

Almost surely, 2^18133812337 is an apocalyptic number.

It is an amenable number.

18133812337 is a deficient number, since it is larger than the sum of its proper divisors (21160499).

18133812337 is an equidigital number, since it uses as much as digits as its factorization.

18133812337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21160498.

The product of its digits is 72576, while the sum is 40.

The spelling of 18133812337 in words is "eighteen billion, one hundred thirty-three million, eight hundred twelve thousand, three hundred thirty-seven".