18268746689 has 4 divisors (see below), whose sum is σ = 18291960624. Its totient is φ = 18245532756.

The previous prime is 18268746647. The next prime is 18268746709. The reversal of 18268746689 is 98664786281.

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 18268746689 - 2¹² = 18268742593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18268746289) 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, 11605787 + ... + 11607360.

It is an arithmetic number, because the mean of its divisors is an integer number (4572990156).

Almost surely, 2^18268746689 is an apocalyptic number.

It is an amenable number.

18268746689 is a deficient number, since it is larger than the sum of its proper divisors (23213935).

18268746689 is an equidigital number, since it uses as much as digits as its factorization.

18268746689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23213934.

The product of its digits is 55738368, while the sum is 65.

The spelling of 18268746689 in words is "eighteen billion, two hundred sixty-eight million, seven hundred forty-six thousand, six hundred eighty-nine".