66566332085 has 16 divisors (see below), whose sum is σ = 89952394752. Its totient is φ = 46850203200.

The previous prime is 66566332051. The next prime is 66566332093. The reversal of 66566332085 is 58023366566.

It is a happy number.

It is not a de Polignac number, because 66566332085 - 2¹⁶ = 66566266549 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19519214 + ... + 19522623.

It is an arithmetic number, because the mean of its divisors is an integer number (5622024672).

Almost surely, 2^66566332085 is an apocalyptic number.

It is an amenable number.

66566332085 is a deficient number, since it is larger than the sum of its proper divisors (23386062667).

66566332085 is a wasteful number, since it uses less digits than its factorization.

66566332085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39041884.

The product of its (nonzero) digits is 4665600, while the sum is 50.

The spelling of 66566332085 in words is "sixty-six billion, five hundred sixty-six million, three hundred thirty-two thousand, eighty-five".