7676667721 has 2 divisors, whose sum is σ = 7676667722. Its totient is φ = 7676667720.

The previous prime is 7676667701. The next prime is 7676667773. The reversal of 7676667721 is 1277666767.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6949556496 + 727111225 = 83364^2 + 26965^2 .

It is a cyclic number.

It is not a de Polignac number, because 7676667721 - 2⁹ = 7676667209 is a prime.

It is not a weakly prime, because it can be changed into another prime (7676667701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3838333860 + 3838333861.

It is an arithmetic number, because the mean of its divisors is an integer number (3838333861).

Almost surely, 2^7676667721 is an apocalyptic number.

It is an amenable number.

7676667721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7676667721 is an equidigital number, since it uses as much as digits as its factorization.

7676667721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6223392, while the sum is 55.

The square root of 7676667721 is about 87616.5950091648. The cubic root of 7676667721 is about 1972.6842672568.

The spelling of 7676667721 in words is "seven billion, six hundred seventy-six million, six hundred sixty-seven thousand, seven hundred twenty-one".