13660665 has 8 divisors (see below), whose sum is σ = 21857088. Its totient is φ = 7285680.

The previous prime is 13660663. The next prime is 13660763. The reversal of 13660665 is 56606631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13660665 - 2¹ = 13660663 is a prime.

It is a super-2 number, since 2×13660665² = 373227536484450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13660663) 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 7 ways as a sum of consecutive naturals, for example, 455341 + ... + 455370.

It is an arithmetic number, because the mean of its divisors is an integer number (2732136).

Almost surely, 2^13660665 is an apocalyptic number.

13660665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13660665 is a deficient number, since it is larger than the sum of its proper divisors (8196423).

13660665 is an equidigital number, since it uses as much as digits as its factorization.

13660665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910719.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 13660665 is about 3696.0336849114. The cubic root of 13660665 is about 239.0510269602.

The spelling of 13660665 in words is "thirteen million, six hundred sixty thousand, six hundred sixty-five".