18132665 has 4 divisors (see below), whose sum is σ = 21759204. Its totient is φ = 14506128.

The previous prime is 18132661. The next prime is 18132683. The reversal of 18132665 is 56623181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56623181 = 83 ⋅682207.

It can be written as a sum of positive squares in 2 ways, for example, as 10837264 + 7295401 = 3292^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 18132665 - 2² = 18132661 is a prime.

It is a super-3 number, since 3×18132665³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18132661) 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 3 ways as a sum of consecutive naturals, for example, 1813262 + ... + 1813271.

It is an arithmetic number, because the mean of its divisors is an integer number (5439801).

Almost surely, 2^18132665 is an apocalyptic number.

It is an amenable number.

18132665 is a deficient number, since it is larger than the sum of its proper divisors (3626539).

18132665 is an equidigital number, since it uses as much as digits as its factorization.

18132665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626538.

The product of its digits is 8640, while the sum is 32.

The square root of 18132665 is about 4258.2467049245. The cubic root of 18132665 is about 262.7164171427.

The spelling of 18132665 in words is "eighteen million, one hundred thirty-two thousand, six hundred sixty-five".