85865040820066 has 32 divisors (see below), whose sum is σ = 134812308787200. Its totient is φ = 40964556064320.

The previous prime is 85865040820049. The next prime is 85865040820099. The reversal of 85865040820066 is 66002804056858.

It is a Harshad number since it is a multiple of its sum of digits (58).

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 15309670 + ... + 20152321.

It is an arithmetic number, because the mean of its divisors is an integer number (4212884649600).

Almost surely, 2^{85865040820066} is an apocalyptic number.

85865040820066 is a deficient number, since it is larger than the sum of its proper divisors (48947267967134).

85865040820066 is a wasteful number, since it uses less digits than its factorization.

85865040820066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35462514.

The product of its (nonzero) digits is 22118400, while the sum is 58.

The spelling of 85865040820066 in words is "eighty-five trillion, eight hundred sixty-five billion, forty million, eight hundred twenty thousand, sixty-six".