18636366065 has 4 divisors (see below), whose sum is σ = 22363639284. Its totient is φ = 14909092848.

The previous prime is 18636366041. The next prime is 18636366107. The reversal of 18636366065 is 56066363681.

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 9799614049 + 8836752016 = 98993^2 + 94004^2 .

It is a cyclic number.

It is not a de Polignac number, because 18636366065 - 2⁸ = 18636365809 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1863636602 + ... + 1863636611.

It is an arithmetic number, because the mean of its divisors is an integer number (5590909821).

Almost surely, 2^18636366065 is an apocalyptic number.

It is an amenable number.

18636366065 is a deficient number, since it is larger than the sum of its proper divisors (3727273219).

18636366065 is an equidigital number, since it uses as much as digits as its factorization.

18636366065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727273218.

The product of its (nonzero) digits is 2799360, while the sum is 50.

The spelling of 18636366065 in words is "eighteen billion, six hundred thirty-six million, three hundred sixty-six thousand, sixty-five".