12679661 has 4 divisors (see below), whose sum is σ = 12832512. Its totient is φ = 12526812.

The previous prime is 12679633. The next prime is 12679663. The reversal of 12679661 is 16697621.

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: 16697621 = 17 ⋅982213.

It is a cyclic number.

It is not a de Polignac number, because 12679661 - 2¹⁰ = 12678637 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 (12679663) 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, 76301 + ... + 76466.

It is an arithmetic number, because the mean of its divisors is an integer number (3208128).

Almost surely, 2^12679661 is an apocalyptic number.

It is an amenable number.

12679661 is a deficient number, since it is larger than the sum of its proper divisors (152851).

12679661 is an equidigital number, since it uses as much as digits as its factorization.

12679661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152850.

The product of its digits is 27216, while the sum is 38.

The square root of 12679661 is about 3560.8511622925. The cubic root of 12679661 is about 233.1860401464.

The spelling of 12679661 in words is "twelve million, six hundred seventy-nine thousand, six hundred sixty-one".