85866663689 has 8 divisors (see below), whose sum is σ = 91854940968. Its totient is φ = 79982530560.

The previous prime is 85866663661. The next prime is 85866663709. The reversal of 85866663689 is 98636666858.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1930723600 + 83935940089 = 43940^2 + 289717^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85866663689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85866663989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26034332 + ... + 26037629.

It is an arithmetic number, because the mean of its divisors is an integer number (11481867621).

Almost surely, 2^85866663689 is an apocalyptic number.

It is an amenable number.

85866663689 is a deficient number, since it is larger than the sum of its proper divisors (5988277279).

85866663689 is a wasteful number, since it uses less digits than its factorization.

85866663689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52072075.

The product of its digits is 537477120, while the sum is 71.

The spelling of 85866663689 in words is "eighty-five billion, eight hundred sixty-six million, six hundred sixty-three thousand, six hundred eighty-nine".