18478817279 has 16 divisors (see below), whose sum is σ = 20109433344. Its totient is φ = 16878348000.

The previous prime is 18478817243. The next prime is 18478817303. The reversal of 18478817279 is 97271887481.

It is a cyclic number.

It is not a de Polignac number, because 18478817279 - 2²⁰ = 18477768703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18478817239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1938134 + ... + 1947644.

It is an arithmetic number, because the mean of its divisors is an integer number (1256839584).

Almost surely, 2^18478817279 is an apocalyptic number.

18478817279 is a deficient number, since it is larger than the sum of its proper divisors (1630616065).

18478817279 is a wasteful number, since it uses less digits than its factorization.

18478817279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11078.

The product of its digits is 12644352, while the sum is 62.

The spelling of 18478817279 in words is "eighteen billion, four hundred seventy-eight million, eight hundred seventeen thousand, two hundred seventy-nine".