85011211009 has 2 divisors, whose sum is σ = 85011211010. Its totient is φ = 85011211008.

The previous prime is 85011210983. The next prime is 85011211013. The reversal of 85011211009 is 90011211058.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83609457409 + 1401753600 = 289153^2 + 37440^2 .

It is a cyclic number.

It is not a de Polignac number, because 85011211009 - 2¹³ = 85011202817 is a prime.

It is not a weakly prime, because it can be changed into another prime (85011211049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42505605504 + 42505605505.

It is an arithmetic number, because the mean of its divisors is an integer number (42505605505).

Almost surely, 2^85011211009 is an apocalyptic number.

It is an amenable number.

85011211009 is a deficient number, since it is larger than the sum of its proper divisors (1).

85011211009 is an equidigital number, since it uses as much as digits as its factorization.

85011211009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 28.

The spelling of 85011211009 in words is "eighty-five billion, eleven million, two hundred eleven thousand, nine".