12646657 has 4 divisors (see below), whose sum is σ = 13390596. Its totient is φ = 11902720.

The previous prime is 12646597. The next prime is 12646661. The reversal of 12646657 is 75664621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75664621 = 5573 ⋅13577.

It can be written as a sum of positive squares in 2 ways, for example, as 9960336 + 2686321 = 3156^2 + 1639^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12646657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12646057) 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, 371944 + ... + 371977.

It is an arithmetic number, because the mean of its divisors is an integer number (3347649).

Almost surely, 2^12646657 is an apocalyptic number.

12646657 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12646657 is a deficient number, since it is larger than the sum of its proper divisors (743939).

12646657 is an equidigital number, since it uses as much as digits as its factorization.

12646657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743938.

The product of its digits is 60480, while the sum is 37.

The square root of 12646657 is about 3556.2138574613. The cubic root of 12646657 is about 232.9835436934.

It can be divided in two parts, 1264 and 6657, that added together give a square (7921 = 89²).

The spelling of 12646657 in words is "twelve million, six hundred forty-six thousand, six hundred fifty-seven".