12660534 has 48 divisors (see below), whose sum is σ = 29214432. Its totient is φ = 3953664.

The previous prime is 12660523. The next prime is 12660541. The reversal of 12660534 is 43506621.

12660534 is a `hidden beast` number, since 1 + 26 + 605 + 34 = 666.

12660534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12660498 and 12660507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21654 + ... + 22230.

It is an arithmetic number, because the mean of its divisors is an integer number (608634).

Almost surely, 2^12660534 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12660534, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14607216).

12660534 is an abundant number, since it is smaller than the sum of its proper divisors (16553898).

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

12660534 is a wasteful number, since it uses less digits than its factorization.

12660534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 12660534 is about 3558.1644144137. The cubic root of 12660534 is about 233.0687290723.

The spelling of 12660534 in words is "twelve million, six hundred sixty thousand, five hundred thirty-four".