18136665 has 12 divisors (see below), whose sum is σ = 31436964. Its totient is φ = 9672864.

The previous prime is 18136633. The next prime is 18136667. The reversal of 18136665 is 56663181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12362256 + 5774409 = 3516^2 + 2403^2 .

It is not a de Polignac number, because 18136665 - 2⁵ = 18136633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18136667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201474 + ... + 201563.

It is an arithmetic number, because the mean of its divisors is an integer number (2619747).

Almost surely, 2^18136665 is an apocalyptic number.

18136665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18136665 is a deficient number, since it is larger than the sum of its proper divisors (13300299).

18136665 is a wasteful number, since it uses less digits than its factorization.

18136665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403048 (or 403045 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 18136665 is about 4258.7163558988. The cubic root of 18136665 is about 262.7357338180.

The spelling of 18136665 in words is "eighteen million, one hundred thirty-six thousand, six hundred sixty-five".