18163663279 has 4 divisors (see below), whose sum is σ = 18324403776. Its totient is φ = 18002922784.

The previous prime is 18163663267. The next prime is 18163663321. The reversal of 18163663279 is 97236636181.

It is a happy number.

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 18163663279 - 2¹³ = 18163655087 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 (18163663079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80370079 + ... + 80370304.

It is an arithmetic number, because the mean of its divisors is an integer number (4581100944).

Almost surely, 2^18163663279 is an apocalyptic number.

18163663279 is a deficient number, since it is larger than the sum of its proper divisors (160740497).

18163663279 is a wasteful number, since it uses less digits than its factorization.

18163663279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160740496.

The product of its digits is 1959552, while the sum is 52.

The spelling of 18163663279 in words is "eighteen billion, one hundred sixty-three million, six hundred sixty-three thousand, two hundred seventy-nine".