18266326916 has 6 divisors (see below), whose sum is σ = 31966072110. Its totient is φ = 9133163456.

The previous prime is 18266326853. The next prime is 18266326927. The reversal of 18266326916 is 61962366281.

It can be written as a sum of positive squares in only one way, i.e., 15185632900 + 3080694016 = 123230^2 + 55504^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2283290861 + ... + 2283290868.

It is an arithmetic number, because the mean of its divisors is an integer number (5327678685).

Almost surely, 2^18266326916 is an apocalyptic number.

It is an amenable number.

18266326916 is a deficient number, since it is larger than the sum of its proper divisors (13699745194).

18266326916 is a wasteful number, since it uses less digits than its factorization.

18266326916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4566581733 (or 4566581731 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 50.

The spelling of 18266326916 in words is "eighteen billion, two hundred sixty-six million, three hundred twenty-six thousand, nine hundred sixteen".