12201665 has 16 divisors (see below), whose sum is σ = 17718912. Its totient is φ = 7874304.

The previous prime is 12201659. The next prime is 12201671. The reversal of 12201665 is 56610221.

12201665 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12201659) and next prime (12201671).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12201665 is a prime.

It is a Duffinian number.

12201665 is strictly pandigital in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 12201665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9659 + ... + 10848.

It is an arithmetic number, because the mean of its divisors is an integer number (1107432).

Almost surely, 2^12201665 is an apocalyptic number.

It is an amenable number.

12201665 is a deficient number, since it is larger than the sum of its proper divisors (5517247).

12201665 is a wasteful number, since it uses less digits than its factorization.

12201665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20536.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12201665 is about 3493.0881752398. The cubic root of 12201665 is about 230.2182238857.

Adding to 12201665 its reverse (56610221), we get a palindrome (68811886).

The spelling of 12201665 in words is "twelve million, two hundred one thousand, six hundred sixty-five".