8258326721 has 2 divisors, whose sum is σ = 8258326722. Its totient is φ = 8258326720.

The previous prime is 8258326697. The next prime is 8258326787. The reversal of 8258326721 is 1276238528.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7109862400 + 1148464321 = 84320^2 + 33889^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8258326721 is a prime.

It is a super-2 number, since 2×8258326721² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8258326121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4129163360 + 4129163361.

It is an arithmetic number, because the mean of its divisors is an integer number (4129163361).

Almost surely, 2^8258326721 is an apocalyptic number.

It is an amenable number.

8258326721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8258326721 is an equidigital number, since it uses as much as digits as its factorization.

8258326721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 44.

The square root of 8258326721 is about 90875.3361534360. The cubic root of 8258326721 is about 2021.2995853297.

The spelling of 8258326721 in words is "eight billion, two hundred fifty-eight million, three hundred twenty-six thousand, seven hundred twenty-one".