8650858721 has 2 divisors, whose sum is σ = 8650858722. Its totient is φ = 8650858720.

The previous prime is 8650858709. The next prime is 8650858757. The reversal of 8650858721 is 1278580568.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7308369121 + 1342489600 = 85489^2 + 36640^2 .

It is a cyclic number.

It is not a de Polignac number, because 8650858721 - 2¹⁰ = 8650857697 is a prime.

It is a super-2 number, since 2×8650858721² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8650858721.

It is not a weakly prime, because it can be changed into another prime (8655858721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4325429360 + 4325429361.

It is an arithmetic number, because the mean of its divisors is an integer number (4325429361).

Almost surely, 2^8650858721 is an apocalyptic number.

It is an amenable number.

8650858721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8650858721 is an equidigital number, since it uses as much as digits as its factorization.

8650858721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1075200, while the sum is 50.

The square root of 8650858721 is about 93009.9925868183. The cubic root of 8650858721 is about 2052.8304127876.

The spelling of 8650858721 in words is "eight billion, six hundred fifty million, eight hundred fifty-eight thousand, seven hundred twenty-one".