18934251113 has 4 divisors (see below), whose sum is σ = 19291501188. Its totient is φ = 18577001040.

The previous prime is 18934251101. The next prime is 18934251163. The reversal of 18934251113 is 31115243981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31115243981 = 617 ⋅50429893.

It can be written as a sum of positive squares in 2 ways, for example, as 7068941929 + 11865309184 = 84077^2 + 108928^2 .

It is a cyclic number.

It is not a de Polignac number, because 18934251113 - 2⁸ = 18934250857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18934251163) 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, 178624958 + ... + 178625063.

It is an arithmetic number, because the mean of its divisors is an integer number (4822875297).

Almost surely, 2^18934251113 is an apocalyptic number.

It is an amenable number.

18934251113 is a deficient number, since it is larger than the sum of its proper divisors (357250075).

18934251113 is an equidigital number, since it uses as much as digits as its factorization.

18934251113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357250074.

The product of its digits is 25920, while the sum is 38.

The spelling of 18934251113 in words is "eighteen billion, nine hundred thirty-four million, two hundred fifty-one thousand, one hundred thirteen".