85447981769 has 2 divisors, whose sum is σ = 85447981770. Its totient is φ = 85447981768.

The previous prime is 85447981733. The next prime is 85447981847. The reversal of 85447981769 is 96718974458.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51999961225 + 33448020544 = 228035^2 + 182888^2 .

It is a cyclic number.

It is not a de Polignac number, because 85447981769 - 2¹² = 85447977673 is a prime.

It is a super-2 number, since 2×85447981769² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 85447981699 and 85447981708.

It is not a weakly prime, because it can be changed into another prime (85447989769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42723990884 + 42723990885.

It is an arithmetic number, because the mean of its divisors is an integer number (42723990885).

Almost surely, 2^85447981769 is an apocalyptic number.

It is an amenable number.

85447981769 is a deficient number, since it is larger than the sum of its proper divisors (1).

85447981769 is an equidigital number, since it uses as much as digits as its factorization.

85447981769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 121927680, while the sum is 68.

The spelling of 85447981769 in words is "eighty-five billion, four hundred forty-seven million, nine hundred eighty-one thousand, seven hundred sixty-nine".