12646553 has 4 divisors (see below), whose sum is σ = 12703488. Its totient is φ = 12589620.

The previous prime is 12646549. The next prime is 12646559. The reversal of 12646553 is 35564621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35564621 = 337 ⋅105533.

It is a cyclic number.

It is not a de Polignac number, because 12646553 - 2² = 12646549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12646559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28133 + ... + 28578.

It is an arithmetic number, because the mean of its divisors is an integer number (3175872).

Almost surely, 2^12646553 is an apocalyptic number.

It is an amenable number.

12646553 is a deficient number, since it is larger than the sum of its proper divisors (56935).

12646553 is an equidigital number, since it uses as much as digits as its factorization.

12646553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56934.

The product of its digits is 21600, while the sum is 32.

The square root of 12646553 is about 3556.1992351385. The cubic root of 12646553 is about 232.9829050436.

The spelling of 12646553 in words is "twelve million, six hundred forty-six thousand, five hundred fifty-three".