12626661 has 4 divisors (see below), whose sum is σ = 16835552. Its totient is φ = 8417772.

The previous prime is 12626651. The next prime is 12626671. The reversal of 12626661 is 16662621.

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: 16662621 = 3 ⋅5554207.

It is an interprime number because it is at equal distance from previous prime (12626651) and next prime (12626671).

It is not a de Polignac number, because 12626661 - 2⁷ = 12626533 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 (12626651) 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, 2104441 + ... + 2104446.

It is an arithmetic number, because the mean of its divisors is an integer number (4208888).

Almost surely, 2^12626661 is an apocalyptic number.

It is an amenable number.

12626661 is a deficient number, since it is larger than the sum of its proper divisors (4208891).

12626661 is an equidigital number, since it uses as much as digits as its factorization.

12626661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4208890.

The product of its digits is 5184, while the sum is 30.

The square root of 12626661 is about 3553.4013283050. The cubic root of 12626661 is about 232.8606865500.

The spelling of 12626661 in words is "twelve million, six hundred twenty-six thousand, six hundred sixty-one".