12666481 has 3 divisors (see below), whose sum is σ = 12670041. Its totient is φ = 12662922.

The previous prime is 12666461. The next prime is 12666503. The reversal of 12666481 is 18466621.

The square root of 12666481 is 3559.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 12666481 - 2¹⁵ = 12633713 is a prime.

It is a super-2 number, since 2×12666481² = 320879481846722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12666421) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1780 + ... + 5338.

It is an arithmetic number, because the mean of its divisors is an integer number (4223347).

Almost surely, 2^12666481 is an apocalyptic number.

12666481 is the 3559-th square number.

12666481 is the 1780-th centered octagonal number.

It is an amenable number.

12666481 is a deficient number, since it is larger than the sum of its proper divisors (3560).

12666481 is an frugal number, since it uses more digits than its factorization.

12666481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7118 (or 3559 counting only the distinct ones).

The product of its digits is 13824, while the sum is 34.

The cubic root of 12666481 is about 233.1052162843.

The spelling of 12666481 in words is "twelve million, six hundred sixty-six thousand, four hundred eighty-one".