85309911975971 has 2 divisors, whose sum is σ = 85309911975972. Its totient is φ = 85309911975970.

The previous prime is 85309911975941. The next prime is 85309911975979. The reversal of 85309911975971 is 17957911990358.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85309911975971 - 2¹⁸ = 85309911713827 is a prime.

It is not a weakly prime, because it can be changed into another prime (85309911975979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42654955987985 + 42654955987986.

It is an arithmetic number, because the mean of its divisors is an integer number (42654955987986).

Almost surely, 2^{85309911975971} is an apocalyptic number.

85309911975971 is a deficient number, since it is larger than the sum of its proper divisors (1).

85309911975971 is an equidigital number, since it uses as much as digits as its factorization.

85309911975971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192893400, while the sum is 74.

The spelling of 85309911975971 in words is "eighty-five trillion, three hundred nine billion, nine hundred eleven million, nine hundred seventy-five thousand, nine hundred seventy-one".