18018065 has 16 divisors (see below), whose sum is σ = 23856336. Its totient is φ = 12979200.

The previous prime is 18018059. The next prime is 18018067. The reversal of 18018065 is 56081081.

It can be written as a sum of positive squares in 8 ways, for example, as 2588881 + 15429184 = 1609^2 + 3928^2 .

It is not a de Polignac number, because 18018065 - 2¹⁴ = 18001681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18018067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 716 + ... + 6045.

It is an arithmetic number, because the mean of its divisors is an integer number (1491021).

Almost surely, 2^18018065 is an apocalyptic number.

It is an amenable number.

18018065 is a deficient number, since it is larger than the sum of its proper divisors (5838271).

18018065 is a wasteful number, since it uses less digits than its factorization.

18018065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6820.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 18018065 is about 4244.7691338870. The cubic root of 18018065 is about 262.1617836133.

The spelling of 18018065 in words is "eighteen million, eighteen thousand, sixty-five".