18489680065 has 4 divisors (see below), whose sum is σ = 22187616084. Its totient is φ = 14791744048.

The previous prime is 18489680047. The next prime is 18489680081. The reversal of 18489680065 is 56008698481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6414087744 + 12075592321 = 80088^2 + 109889^2 .

It is a cyclic number.

It is not a de Polignac number, because 18489680065 - 2²⁷ = 18355462337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18489679988 and 18489680015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1848968002 + ... + 1848968011.

It is an arithmetic number, because the mean of its divisors is an integer number (5546904021).

Almost surely, 2^18489680065 is an apocalyptic number.

It is an amenable number.

18489680065 is a deficient number, since it is larger than the sum of its proper divisors (3697936019).

18489680065 is an equidigital number, since it uses as much as digits as its factorization.

18489680065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3697936018.

The product of its (nonzero) digits is 3317760, while the sum is 55.

The spelling of 18489680065 in words is "eighteen billion, four hundred eighty-nine million, six hundred eighty thousand, sixty-five".