12660557 has 24 divisors (see below), whose sum is σ = 16351104. Its totient is φ = 9545184.

The previous prime is 12660553. The next prime is 12660569. The reversal of 12660557 is 75506621.

It is a happy number.

12660557 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12660557 - 2² = 12660553 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12660551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48008 + ... + 48270.

It is an arithmetic number, because the mean of its divisors is an integer number (681296).

Almost surely, 2^12660557 is an apocalyptic number.

It is an amenable number.

12660557 is a deficient number, since it is larger than the sum of its proper divisors (3690547).

12660557 is a wasteful number, since it uses less digits than its factorization.

12660557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 12660557 is about 3558.1676464158. The cubic root of 12660557 is about 233.0688702085.

The spelling of 12660557 in words is "twelve million, six hundred sixty thousand, five hundred fifty-seven".