7756795721 has 2 divisors, whose sum is σ = 7756795722. Its totient is φ = 7756795720.

The previous prime is 7756795693. The next prime is 7756795763. The reversal of 7756795721 is 1275976577.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7351176121 + 405619600 = 85739^2 + 20140^2 .

It is an emirp because it is prime and its reverse (1275976577) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7756795721 is a prime.

It is not a weakly prime, because it can be changed into another prime (7756795421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3878397860 + 3878397861.

It is an arithmetic number, because the mean of its divisors is an integer number (3878397861).

Almost surely, 2^7756795721 is an apocalyptic number.

It is an amenable number.

7756795721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7756795721 is an equidigital number, since it uses as much as digits as its factorization.

7756795721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6482700, while the sum is 56.

The square root of 7756795721 is about 88072.6729525112. The cubic root of 7756795721 is about 1979.5240600947.

The spelling of 7756795721 in words is "seven billion, seven hundred fifty-six million, seven hundred ninety-five thousand, seven hundred twenty-one".