12661879 has 2 divisors, whose sum is σ = 12661880. Its totient is φ = 12661878.

The previous prime is 12661877. The next prime is 12661903. The reversal of 12661879 is 97816621.

12661879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12661879 - 2¹ = 12661877 is a prime.

Together with 12661877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12661877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330939 + 6330940.

It is an arithmetic number, because the mean of its divisors is an integer number (6330940).

Almost surely, 2^12661879 is an apocalyptic number.

12661879 is a deficient number, since it is larger than the sum of its proper divisors (1).

12661879 is an equidigital number, since it uses as much as digits as its factorization.

12661879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 40.

The square root of 12661879 is about 3558.3534113407. The cubic root of 12661879 is about 233.0769821823.

The spelling of 12661879 in words is "twelve million, six hundred sixty-one thousand, eight hundred seventy-nine".