12621566 has 8 divisors (see below), whose sum is σ = 19120104. Its totient is φ = 6248200.

The previous prime is 12621547. The next prime is 12621569. The reversal of 12621566 is 66512621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12621569) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 31040 + ... + 31443.

It is an arithmetic number, because the mean of its divisors is an integer number (2390013).

Almost surely, 2^12621566 is an apocalyptic number.

12621566 is a deficient number, since it is larger than the sum of its proper divisors (6498538).

12621566 is a wasteful number, since it uses less digits than its factorization.

12621566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62586.

The product of its digits is 4320, while the sum is 29.

The square root of 12621566 is about 3552.6843372301. The cubic root of 12621566 is about 232.8293616993.

The spelling of 12621566 in words is "twelve million, six hundred twenty-one thousand, five hundred sixty-six".