800663641 has 2 divisors, whose sum is σ = 800663642. Its totient is φ = 800663640.

The previous prime is 800663627. The next prime is 800663653. The reversal of 800663641 is 146366008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 800663616 + 25 = 28296^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 800663641 - 2¹¹ = 800661593 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 800663597 and 800663606.

It is not a weakly prime, because it can be changed into another prime (800663681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400331820 + 400331821.

It is an arithmetic number, because the mean of its divisors is an integer number (400331821).

Almost surely, 2^800663641 is an apocalyptic number.

It is an amenable number.

800663641 is a deficient number, since it is larger than the sum of its proper divisors (1).

800663641 is an equidigital number, since it uses as much as digits as its factorization.

800663641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 800663641 is about 28296.0004417585. Note that the first 3 decimals coincide. The cubic root of 800663641 is about 928.5743914958.

The spelling of 800663641 in words is "eight hundred million, six hundred sixty-three thousand, six hundred forty-one".