18749748313 has 4 divisors (see below), whose sum is σ = 18875585700. Its totient is φ = 18623910928.

The previous prime is 18749748271. The next prime is 18749748377. The reversal of 18749748313 is 31384794781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31384794781 = 193 ⋅162615517.

It can be written as a sum of positive squares in 2 ways, for example, as 2682411264 + 16067337049 = 51792^2 + 126757^2 .

It is a cyclic number.

It is not a de Polignac number, because 18749748313 - 2²¹ = 18747651161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18749748013) 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, 62918470 + ... + 62918767.

It is an arithmetic number, because the mean of its divisors is an integer number (4718896425).

Almost surely, 2^18749748313 is an apocalyptic number.

It is an amenable number.

18749748313 is a deficient number, since it is larger than the sum of its proper divisors (125837387).

18749748313 is a wasteful number, since it uses less digits than its factorization.

18749748313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125837386.

The product of its digits is 4064256, while the sum is 55.

The spelling of 18749748313 in words is "eighteen billion, seven hundred forty-nine million, seven hundred forty-eight thousand, three hundred thirteen".