66000859 has 8 divisors (see below), whose sum is σ = 67886240. Its totient is φ = 64167768.

The previous prime is 66000821. The next prime is 66000863. The reversal of 66000859 is 95800066.

It is not a de Polignac number, because 66000859 - 2¹⁷ = 65869787 is a prime.

It is a super-2 number, since 2×66000859² = 8712226777475762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66000899) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 50002 + ... + 51304.

It is an arithmetic number, because the mean of its divisors is an integer number (8485780).

Almost surely, 2^66000859 is an apocalyptic number.

66000859 is a deficient number, since it is larger than the sum of its proper divisors (1885381).

66000859 is an frugal number, since it uses more digits than its factorization.

66000859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414 (or 1340 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 66000859 is about 8124.0912722593. The cubic root of 66000859 is about 404.1257552997.

The spelling of 66000859 in words is "sixty-six million, eight hundred fifty-nine", and thus it is an aban number.