18849184237 has 4 divisors (see below), whose sum is σ = 20299121500. Its totient is φ = 17399246976.

The previous prime is 18849184223. The next prime is 18849184271. The reversal of 18849184237 is 73248194881.

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 10922131081 + 7927053156 = 104509^2 + 89034^2 .

It is a cyclic number.

It is not a de Polignac number, because 18849184237 - 2²³ = 18840795629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18849184217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724968612 + ... + 724968637.

It is an arithmetic number, because the mean of its divisors is an integer number (5074780375).

Almost surely, 2^18849184237 is an apocalyptic number.

It is an amenable number.

18849184237 is a deficient number, since it is larger than the sum of its proper divisors (1449937263).

18849184237 is a wasteful number, since it uses less digits than its factorization.

18849184237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449937262.

The product of its digits is 3096576, while the sum is 55.

The spelling of 18849184237 in words is "eighteen billion, eight hundred forty-nine million, one hundred eighty-four thousand, two hundred thirty-seven".