18559543679 has 4 divisors (see below), whose sum is σ = 18559916976. Its totient is φ = 18559170384.

The previous prime is 18559543669. The next prime is 18559543703. The reversal of 18559543679 is 97634595581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97634595581 = 1109 ⋅88038409.

It is a cyclic number.

It is not a de Polignac number, because 18559543679 - 2⁸ = 18559543423 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 (18559543669) 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, 98054 + ... + 216179.

It is an arithmetic number, because the mean of its divisors is an integer number (4639979244).

Almost surely, 2^18559543679 is an apocalyptic number.

18559543679 is a deficient number, since it is larger than the sum of its proper divisors (373297).

18559543679 is an equidigital number, since it uses as much as digits as its factorization.

18559543679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373296.

The product of its digits is 40824000, while the sum is 62.

The spelling of 18559543679 in words is "eighteen billion, five hundred fifty-nine million, five hundred forty-three thousand, six hundred seventy-nine".