18753493813 has 4 divisors (see below), whose sum is σ = 18760308588. Its totient is φ = 18746679040.

The previous prime is 18753493799. The next prime is 18753493819. The reversal of 18753493813 is 31839435781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31839435781 = 313 ⋅101723437.

It can be written as a sum of positive squares in 2 ways, for example, as 14752045764 + 4001448049 = 121458^2 + 63257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18753493813 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 (18753493819) 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, 3403258 + ... + 3408763.

It is an arithmetic number, because the mean of its divisors is an integer number (4690077147).

Almost surely, 2^18753493813 is an apocalyptic number.

It is an amenable number.

18753493813 is a deficient number, since it is larger than the sum of its proper divisors (6814775).

18753493813 is an equidigital number, since it uses as much as digits as its factorization.

18753493813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6814774.

The product of its digits is 2177280, while the sum is 52.

The spelling of 18753493813 in words is "eighteen billion, seven hundred fifty-three million, four hundred ninety-three thousand, eight hundred thirteen".