12641566 has 16 divisors (see below), whose sum is σ = 21805056. Its totient is φ = 5384376.

The previous prime is 12641561. The next prime is 12641567. The reversal of 12641566 is 66514621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12641561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 366 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (1362816).

Almost surely, 2^12641566 is an apocalyptic number.

12641566 is a deficient number, since it is larger than the sum of its proper divisors (9163490).

12641566 is a wasteful number, since it uses less digits than its factorization.

12641566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5583.

The product of its digits is 8640, while the sum is 31.

The square root of 12641566 is about 3555.4979960619. The cubic root of 12641566 is about 232.9522764471.

The spelling of 12641566 in words is "twelve million, six hundred forty-one thousand, five hundred sixty-six".