18023994313 has 8 divisors (see below), whose sum is σ = 19429938248. Its totient is φ = 16620833664.

The previous prime is 18023994293. The next prime is 18023994319. The reversal of 18023994313 is 31349932081.

It can be written as a sum of positive squares in 4 ways, for example, as 5696777529 + 12327216784 = 75477^2 + 111028^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18023994313 - 2⁵ = 18023994281 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 18023994313.

It is not an unprimeable number, because it can be changed into a prime (18023994319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 682356 + ... + 708277.

It is an arithmetic number, because the mean of its divisors is an integer number (2428742281).

Almost surely, 2^18023994313 is an apocalyptic number.

18023994313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18023994313 is a deficient number, since it is larger than the sum of its proper divisors (1405943935).

18023994313 is a wasteful number, since it uses less digits than its factorization.

18023994313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391643.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 18023994313 in words is "eighteen billion, twenty-three million, nine hundred ninety-four thousand, three hundred thirteen".