18663279817 has 32 divisors (see below), whose sum is σ = 23883552000. Its totient is φ = 14184592128.

The previous prime is 18663279799. The next prime is 18663279821. The reversal of 18663279817 is 71897236681.

It is not a de Polignac number, because 18663279817 - 2¹¹ = 18663277769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18663279857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 501934 + ... + 537832.

It is an arithmetic number, because the mean of its divisors is an integer number (746361000).

Almost surely, 2^18663279817 is an apocalyptic number.

It is an amenable number.

18663279817 is a deficient number, since it is larger than the sum of its proper divisors (5220272183).

18663279817 is a wasteful number, since it uses less digits than its factorization.

18663279817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36145.

The product of its digits is 6096384, while the sum is 58.

The spelling of 18663279817 in words is "eighteen billion, six hundred sixty-three million, two hundred seventy-nine thousand, eight hundred seventeen".