12666534 has 8 divisors (see below), whose sum is σ = 25333080. Its totient is φ = 4222176.

The previous prime is 12666529. The next prime is 12666539. The reversal of 12666534 is 43566621.

It is an interprime number because it is at equal distance from previous prime (12666529) and next prime (12666539).

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

12666534 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 12666495 and 12666504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1055539 + ... + 1055550.

It is an arithmetic number, because the mean of its divisors is an integer number (3166635).

Almost surely, 2^12666534 is an apocalyptic number.

12666534 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12666534 is a wasteful number, since it uses less digits than its factorization.

12666534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111094.

The product of its digits is 25920, while the sum is 33.

The square root of 12666534 is about 3559.0074459040. The cubic root of 12666534 is about 233.1055414091.

The spelling of 12666534 in words is "twelve million, six hundred sixty-six thousand, five hundred thirty-four".