806808557 has 2 divisors, whose sum is σ = 806808558. Its totient is φ = 806808556.

The previous prime is 806808529. The next prime is 806808637. The reversal of 806808557 is 755808608.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 723287236 + 83521321 = 26894^2 + 9139^2 .

It is a cyclic number.

It is not a de Polignac number, because 806808557 - 2⁶ = 806808493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (806808857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 403404278 + 403404279.

It is an arithmetic number, because the mean of its divisors is an integer number (403404279).

Almost surely, 2^806808557 is an apocalyptic number.

It is an amenable number.

806808557 is a deficient number, since it is larger than the sum of its proper divisors (1).

806808557 is an equidigital number, since it uses as much as digits as its factorization.

806808557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 537600, while the sum is 47.

The square root of 806808557 is about 28404.3756664356. The cubic root of 806808557 is about 930.9438742637.

The spelling of 806808557 in words is "eight hundred six million, eight hundred eight thousand, five hundred fifty-seven".