800767661 has 2 divisors, whose sum is σ = 800767662. Its totient is φ = 800767660.

The previous prime is 800767657. The next prime is 800767687. The reversal of 800767661 is 166767008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 778968100 + 21799561 = 27910^2 + 4669^2 .

It is a cyclic number.

It is not a de Polignac number, because 800767661 - 2² = 800767657 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (800767361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400383830 + 400383831.

It is an arithmetic number, because the mean of its divisors is an integer number (400383831).

Almost surely, 2^800767661 is an apocalyptic number.

It is an amenable number.

800767661 is a deficient number, since it is larger than the sum of its proper divisors (1).

800767661 is an equidigital number, since it uses as much as digits as its factorization.

800767661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 800767661 is about 28297.8384510195. The cubic root of 800767661 is about 928.6146023578.

The spelling of 800767661 in words is "eight hundred million, seven hundred sixty-seven thousand, six hundred sixty-one".