66800085 has 16 divisors (see below), whose sum is σ = 116596800. Its totient is φ = 32387840.

The previous prime is 66800081. The next prime is 66800093. The reversal of 66800085 is 58000866.

It is not a de Polignac number, because 66800085 - 2² = 66800081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66800081) 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 15 ways as a sum of consecutive naturals, for example, 202260 + ... + 202589.

It is an arithmetic number, because the mean of its divisors is an integer number (7287300).

Almost surely, 2^66800085 is an apocalyptic number.

It is an amenable number.

66800085 is a deficient number, since it is larger than the sum of its proper divisors (49796715).

66800085 is a wasteful number, since it uses less digits than its factorization.

66800085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404868.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 66800085 is about 8173.1318966477. The cubic root of 66800085 is about 405.7504452131.

The spelling of 66800085 in words is "sixty-six million, eight hundred thousand, eighty-five".