12551665 has 16 divisors (see below), whose sum is σ = 17498880. Its totient is φ = 8464320.

The previous prime is 12551663. The next prime is 12551681. The reversal of 12551665 is 56615521.

It is not a de Polignac number, because 12551665 - 2¹ = 12551663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12551663) 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, 805 + ... + 5074.

It is an arithmetic number, because the mean of its divisors is an integer number (1093680).

Almost surely, 2^12551665 is an apocalyptic number.

It is an amenable number.

12551665 is a deficient number, since it is larger than the sum of its proper divisors (4947215).

12551665 is an equidigital number, since it uses as much as digits as its factorization.

12551665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5952.

The product of its digits is 9000, while the sum is 31.

The square root of 12551665 is about 3542.8329060231. The cubic root of 12551665 is about 232.3987457508.

The spelling of 12551665 in words is "twelve million, five hundred fifty-one thousand, six hundred sixty-five".