18335688749 has 4 divisors (see below), whose sum is σ = 20955072864. Its totient is φ = 15716304636.

The previous prime is 18335688703. The next prime is 18335688841. The reversal of 18335688749 is 94788653381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18335688749 - 2²⁸ = 18067253293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18335688691 and 18335688700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18335688149) 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, 1309692047 + ... + 1309692060.

It is an arithmetic number, because the mean of its divisors is an integer number (5238768216).

Almost surely, 2^18335688749 is an apocalyptic number.

It is an amenable number.

18335688749 is a deficient number, since it is larger than the sum of its proper divisors (2619384115).

18335688749 is an equidigital number, since it uses as much as digits as its factorization.

18335688749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2619384114.

The product of its digits is 34836480, while the sum is 62.

The spelling of 18335688749 in words is "eighteen billion, three hundred thirty-five million, six hundred eighty-eight thousand, seven hundred forty-nine".