18206887679 has 4 divisors (see below), whose sum is σ = 18207159960. Its totient is φ = 18206615400.

The previous prime is 18206887639. The next prime is 18206887759. The reversal of 18206887679 is 97678860281.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18206887679 - 2²⁸ = 17938452223 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 (18206887639) 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, 40937 + ... + 195165.

It is an arithmetic number, because the mean of its divisors is an integer number (4551789990).

Almost surely, 2^18206887679 is an apocalyptic number.

18206887679 is a deficient number, since it is larger than the sum of its proper divisors (272281).

18206887679 is a wasteful number, since it uses less digits than its factorization.

18206887679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272280.

The product of its (nonzero) digits is 16257024, while the sum is 62.

The spelling of 18206887679 in words is "eighteen billion, two hundred six million, eight hundred eighty-seven thousand, six hundred seventy-nine".