12666550 has 36 divisors (see below), whose sum is σ = 25528500. Its totient is φ = 4673760.

The previous prime is 12666539. The next prime is 12666557. The reversal of 12666550 is 5566621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666557) 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 17 ways as a sum of consecutive naturals, for example, 7701 + ... + 9199.

It is an arithmetic number, because the mean of its divisors is an integer number (709125).

Almost surely, 2^12666550 is an apocalyptic number.

12666550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12666550 is an abundant number, since it is smaller than the sum of its proper divisors (12861950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12666550 is a wasteful number, since it uses less digits than its factorization.

12666550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1537 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 12666550 is about 3559.0096937210. The cubic root of 12666550 is about 233.1056395598.

The spelling of 12666550 in words is "twelve million, six hundred sixty-six thousand, five hundred fifty".