12271665 has 32 divisors (see below), whose sum is σ = 22761216. Its totient is φ = 5529600.

The previous prime is 12271643. The next prime is 12271681. The reversal of 12271665 is 56617221.

It is not a de Polignac number, because 12271665 - 2⁷ = 12271537 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6865 + ... + 8465.

It is an arithmetic number, because the mean of its divisors is an integer number (711288).

Almost surely, 2^12271665 is an apocalyptic number.

12271665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12271665 is a deficient number, since it is larger than the sum of its proper divisors (10489551).

12271665 is a wasteful number, since it uses less digits than its factorization.

12271665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1689.

The product of its digits is 5040, while the sum is 30.

The square root of 12271665 is about 3503.0936327766. The cubic root of 12271665 is about 230.6576326647.

Adding to 12271665 its reverse (56617221), we get a palindrome (68888886).

The spelling of 12271665 in words is "twelve million, two hundred seventy-one thousand, six hundred sixty-five".