85811260378009 has 2 divisors, whose sum is σ = 85811260378010. Its totient is φ = 85811260378008.

The previous prime is 85811260377989. The next prime is 85811260378061. The reversal of 85811260378009 is 90087306211858.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74207835673609 + 11603424704400 = 8614397^2 + 3406380^2 .

It is a cyclic number.

It is not a de Polignac number, because 85811260378009 - 2⁵ = 85811260377977 is a prime.

It is not a weakly prime, because it can be changed into another prime (85811260378309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42905630189004 + 42905630189005.

It is an arithmetic number, because the mean of its divisors is an integer number (42905630189005).

Almost surely, 2^{85811260378009} is an apocalyptic number.

It is an amenable number.

85811260378009 is a deficient number, since it is larger than the sum of its proper divisors (1).

85811260378009 is an equidigital number, since it uses as much as digits as its factorization.

85811260378009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 58.

The spelling of 85811260378009 in words is "eighty-five trillion, eight hundred eleven billion, two hundred sixty million, three hundred seventy-eight thousand, nine".