7968661 has 2 divisors, whose sum is σ = 7968662. Its totient is φ = 7968660.

The previous prime is 7968641. The next prime is 7968673. The reversal of 7968661 is 1668697.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6599761 + 1368900 = 2569^2 + 1170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7968661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7968641) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3984330 + 3984331.

It is an arithmetic number, because the mean of its divisors is an integer number (3984331).

Almost surely, 2^7968661 is an apocalyptic number.

It is an amenable number.

7968661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7968661 is an equidigital number, since it uses as much as digits as its factorization.

7968661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 43.

The square root of 7968661 is about 2822.8816836701. The cubic root of 7968661 is about 199.7384999042.

The spelling of 7968661 in words is "seven million, nine hundred sixty-eight thousand, six hundred sixty-one".