18647819479 has 4 divisors (see below), whose sum is σ = 18648264280. Its totient is φ = 18647374680.

The previous prime is 18647819471. The next prime is 18647819501. The reversal of 18647819479 is 97491874681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18647819479 - 2³ = 18647819471 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 18647819479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18647819471) 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, 152109 + ... + 245830.

It is an arithmetic number, because the mean of its divisors is an integer number (4662066070).

Almost surely, 2^18647819479 is an apocalyptic number.

18647819479 is a deficient number, since it is larger than the sum of its proper divisors (444801).

18647819479 is an equidigital number, since it uses as much as digits as its factorization.

18647819479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444800.

The product of its digits is 24385536, while the sum is 64.

The spelling of 18647819479 in words is "eighteen billion, six hundred forty-seven million, eight hundred nineteen thousand, four hundred seventy-nine".