18183997679 has 4 divisors (see below), whose sum is σ = 18184281720. Its totient is φ = 18183713640.

The previous prime is 18183997669. The next prime is 18183997721. The reversal of 18183997679 is 97679938181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97679938181 = 7 ⋅13954276883.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18183997679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18183997669) 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, 4169 + ... + 190749.

It is an arithmetic number, because the mean of its divisors is an integer number (4546070430).

Almost surely, 2^18183997679 is an apocalyptic number.

18183997679 is a deficient number, since it is larger than the sum of its proper divisors (284041).

18183997679 is an equidigital number, since it uses as much as digits as its factorization.

18183997679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284040.

The product of its digits is 41150592, while the sum is 68.

The spelling of 18183997679 in words is "eighteen billion, one hundred eighty-three million, nine hundred ninety-seven thousand, six hundred seventy-nine".