8658658721 has 2 divisors, whose sum is σ = 8658658722. Its totient is φ = 8658658720.

The previous prime is 8658658709. The next prime is 8658658733. The reversal of 8658658721 is 1278568568.

It is a happy number.

8658658721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (8658658709) and next prime (8658658733).

It can be written as a sum of positive squares in only one way, i.e., 8656441600 + 2217121 = 93040^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 8658658721 - 2²² = 8654464417 is a prime.

It is not a weakly prime, because it can be changed into another prime (8658658121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4329329360 + 4329329361.

It is an arithmetic number, because the mean of its divisors is an integer number (4329329361).

Almost surely, 2^8658658721 is an apocalyptic number.

It is an amenable number.

8658658721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8658658721 is an equidigital number, since it uses as much as digits as its factorization.

8658658721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6451200, while the sum is 56.

The square root of 8658658721 is about 93051.9141178729. The cubic root of 8658658721 is about 2053.4472019313.

The spelling of 8658658721 in words is "eight billion, six hundred fifty-eight million, six hundred fifty-eight thousand, seven hundred twenty-one".