12664961 has 2 divisors, whose sum is σ = 12664962. Its totient is φ = 12664960.

The previous prime is 12664931. The next prime is 12664979. The reversal of 12664961 is 16946621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12117361 + 547600 = 3481^2 + 740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12664961 is a prime.

It is not a weakly prime, because it can be changed into another prime (12664921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6332480 + 6332481.

It is an arithmetic number, because the mean of its divisors is an integer number (6332481).

Almost surely, 2^12664961 is an apocalyptic number.

It is an amenable number.

12664961 is a deficient number, since it is larger than the sum of its proper divisors (1).

12664961 is an equidigital number, since it uses as much as digits as its factorization.

12664961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The square root of 12664961 is about 3558.7864504631. The cubic root of 12664961 is about 233.0958915660.

The spelling of 12664961 in words is "twelve million, six hundred sixty-four thousand, nine hundred sixty-one".