12637661 has 4 divisors (see below), whose sum is σ = 12660672. Its totient is φ = 12614652.

The previous prime is 12637637. The next prime is 12637673. The reversal of 12637661 is 16673621.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12637661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12637621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10661 + ... + 11786.

It is an arithmetic number, because the mean of its divisors is an integer number (3165168).

Almost surely, 2^12637661 is an apocalyptic number.

It is an amenable number.

12637661 is a deficient number, since it is larger than the sum of its proper divisors (23011).

12637661 is an equidigital number, since it uses as much as digits as its factorization.

12637661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23010.

The product of its digits is 9072, while the sum is 32.

The square root of 12637661 is about 3554.9488041321. The cubic root of 12637661 is about 232.9282875330.

The spelling of 12637661 in words is "twelve million, six hundred thirty-seven thousand, six hundred sixty-one".