845816641 has 2 divisors, whose sum is σ = 845816642. Its totient is φ = 845816640.

The previous prime is 845816599. The next prime is 845816659. The reversal of 845816641 is 146618548.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 818818225 + 26998416 = 28615^2 + 5196^2 .

It is a cyclic number.

It is not a de Polignac number, because 845816641 - 2¹⁷ = 845685569 is a prime.

It is not a weakly prime, because it can be changed into another prime (845816441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422908320 + 422908321.

It is an arithmetic number, because the mean of its divisors is an integer number (422908321).

Almost surely, 2^845816641 is an apocalyptic number.

It is an amenable number.

845816641 is a deficient number, since it is larger than the sum of its proper divisors (1).

845816641 is an equidigital number, since it uses as much as digits as its factorization.

845816641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 184320, while the sum is 43.

The square root of 845816641 is about 29082.9269675526. The cubic root of 845816641 is about 945.7116560162.

The spelling of 845816641 in words is "eight hundred forty-five million, eight hundred sixteen thousand, six hundred forty-one".