12640166 has 32 divisors (see below), whose sum is σ = 23811840. Its totient is φ = 4888800.

The previous prime is 12640141. The next prime is 12640171. The reversal of 12640166 is 66104621.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 32300 + ... + 32688.

It is an arithmetic number, because the mean of its divisors is an integer number (744120).

Almost surely, 2^12640166 is an apocalyptic number.

12640166 is a deficient number, since it is larger than the sum of its proper divisors (11171674).

12640166 is a wasteful number, since it uses less digits than its factorization.

12640166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 12640166 is about 3555.3011124235. The cubic root of 12640166 is about 232.9436766363.

Adding to 12640166 its reverse (66104621), we get a palindrome (78744787).

The spelling of 12640166 in words is "twelve million, six hundred forty thousand, one hundred sixty-six".