849446005721 has 2 divisors, whose sum is σ = 849446005722. Its totient is φ = 849446005720.

The previous prime is 849446005699. The next prime is 849446005757. The reversal of 849446005721 is 127500644948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 510954765721 + 338491240000 = 714811^2 + 581800^2 .

It is a cyclic number.

It is not a de Polignac number, because 849446005721 - 2³⁰ = 848372263897 is a prime.

It is a super-2 number, since 2×849446005721² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 849446005721.

It is not a weakly prime, because it can be changed into another prime (849446005781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 424723002860 + 424723002861.

It is an arithmetic number, because the mean of its divisors is an integer number (424723002861).

Almost surely, 2^849446005721 is an apocalyptic number.

It is an amenable number.

849446005721 is a deficient number, since it is larger than the sum of its proper divisors (1).

849446005721 is an equidigital number, since it uses as much as digits as its factorization.

849446005721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The spelling of 849446005721 in words is "eight hundred forty-nine billion, four hundred forty-six million, five thousand, seven hundred twenty-one".