85640808897 has 80 divisors (see below), whose sum is σ = 158585720832. Its totient is φ = 44935326720.

The previous prime is 85640808887. The next prime is 85640808941. The reversal of 85640808897 is 79880804658.

It is not a de Polignac number, because 85640808897 - 2⁴ = 85640808881 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (85640808857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 286848 + ... + 503550.

Almost surely, 2^85640808897 is an apocalyptic number.

It is an amenable number.

85640808897 is a deficient number, since it is larger than the sum of its proper divisors (72944911935).

85640808897 is a wasteful number, since it uses less digits than its factorization.

85640808897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216780 (or 216771 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 63.

The spelling of 85640808897 in words is "eighty-five billion, six hundred forty million, eight hundred eight thousand, eight hundred ninety-seven".