8078268721 has 2 divisors, whose sum is σ = 8078268722. Its totient is φ = 8078268720.

The previous prime is 8078268661. The next prime is 8078268763. The reversal of 8078268721 is 1278628708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7970918400 + 107350321 = 89280^2 + 10361^2 .

It is a cyclic number.

It is not a de Polignac number, because 8078268721 - 2¹⁵ = 8078235953 is a prime.

It is not a weakly prime, because it can be changed into another prime (8078268521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4039134360 + 4039134361.

It is an arithmetic number, because the mean of its divisors is an integer number (4039134361).

Almost surely, 2^8078268721 is an apocalyptic number.

It is an amenable number.

8078268721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8078268721 is an equidigital number, since it uses as much as digits as its factorization.

8078268721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 602112, while the sum is 49.

The square root of 8078268721 is about 89879.1895880242. The cubic root of 8078268721 is about 2006.5012374738.

The spelling of 8078268721 in words is "eight billion, seventy-eight million, two hundred sixty-eight thousand, seven hundred twenty-one".