12661655 has 4 divisors (see below), whose sum is σ = 15193992. Its totient is φ = 10129320.

The previous prime is 12661637. The next prime is 12661667. The reversal of 12661655 is 55616621.

12661655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 12661655 - 2⁶ = 12661591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1266161 + ... + 1266170.

It is an arithmetic number, because the mean of its divisors is an integer number (3798498).

Almost surely, 2^12661655 is an apocalyptic number.

12661655 is a deficient number, since it is larger than the sum of its proper divisors (2532337).

12661655 is an equidigital number, since it uses as much as digits as its factorization.

12661655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2532336.

The product of its digits is 10800, while the sum is 32.

The square root of 12661655 is about 3558.3219359693. The cubic root of 12661655 is about 233.0756077273.

The spelling of 12661655 in words is "twelve million, six hundred sixty-one thousand, six hundred fifty-five".