12551666 has 16 divisors (see below), whose sum is σ = 19971360. Its totient is φ = 5899680.

The previous prime is 12551663. The next prime is 12551681. The reversal of 12551666 is 66615521.

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 7 ways as a sum of consecutive naturals, for example, 4001 + ... + 6411.

It is an arithmetic number, because the mean of its divisors is an integer number (1248210).

Almost surely, 2^12551666 is an apocalyptic number.

12551666 is a deficient number, since it is larger than the sum of its proper divisors (7419694).

12551666 is a wasteful number, since it uses less digits than its factorization.

12551666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2569.

The product of its digits is 10800, while the sum is 32.

The square root of 12551666 is about 3542.8330471531. The cubic root of 12551666 is about 232.3987519226.

The spelling of 12551666 in words is "twelve million, five hundred fifty-one thousand, six hundred sixty-six".