85644311369 has 2 divisors, whose sum is σ = 85644311370. Its totient is φ = 85644311368.

The previous prime is 85644311341. The next prime is 85644311381. The reversal of 85644311369 is 96311344658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55563918400 + 30080392969 = 235720^2 + 173437^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85644311369 is a prime.

It is a super-2 number, since 2×85644311369² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85644211369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42822155684 + 42822155685.

It is an arithmetic number, because the mean of its divisors is an integer number (42822155685).

Almost surely, 2^85644311369 is an apocalyptic number.

It is an amenable number.

85644311369 is a deficient number, since it is larger than the sum of its proper divisors (1).

85644311369 is an equidigital number, since it uses as much as digits as its factorization.

85644311369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 50.

The spelling of 85644311369 in words is "eighty-five billion, six hundred forty-four million, three hundred eleven thousand, three hundred sixty-nine".