7850857009 has 2 divisors, whose sum is σ = 7850857010. Its totient is φ = 7850857008.

The previous prime is 7850856991. The next prime is 7850857073. The reversal of 7850857009 is 9007580587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7116609600 + 734247409 = 84360^2 + 27097^2 .

It is a cyclic number.

It is not a de Polignac number, because 7850857009 - 2⁵ = 7850856977 is a prime.

It is not a weakly prime, because it can be changed into another prime (7850857109) 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, 3925428504 + 3925428505.

It is an arithmetic number, because the mean of its divisors is an integer number (3925428505).

Almost surely, 2^7850857009 is an apocalyptic number.

It is an amenable number.

7850857009 is a deficient number, since it is larger than the sum of its proper divisors (1).

7850857009 is an equidigital number, since it uses as much as digits as its factorization.

7850857009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705600, while the sum is 49.

The square root of 7850857009 is about 88605.0619829364. The cubic root of 7850857009 is about 1987.4933725713.

The spelling of 7850857009 in words is "seven billion, eight hundred fifty million, eight hundred fifty-seven thousand, nine".