18366985017 has 24 divisors (see below), whose sum is σ = 26821883816. Its totient is φ = 12110155776.

The previous prime is 18366985001. The next prime is 18366985027. The reversal of 18366985017 is 71058966381.

18366985017 is a `hidden beast` number, since 18 + 36 + 6 + 98 + 501 + 7 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 245517561 + 18121467456 = 15669^2 + 134616^2 .

It is not a de Polignac number, because 18366985017 - 2⁴ = 18366985001 is a prime.

It is a super-2 number, since 2×18366985017² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18366985027) 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 23 ways as a sum of consecutive naturals, for example, 1440213 + ... + 1452909.

Almost surely, 2^18366985017 is an apocalyptic number.

It is an amenable number.

18366985017 is a deficient number, since it is larger than the sum of its proper divisors (8454898799).

18366985017 is a wasteful number, since it uses less digits than its factorization.

18366985017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14457 (or 14454 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 18366985017 in words is "eighteen billion, three hundred sixty-six million, nine hundred eighty-five thousand, seventeen".