66805306 has 16 divisors (see below), whose sum is σ = 101399040. Its totient is φ = 33008320.

The previous prime is 66805303. The next prime is 66805307. The reversal of 66805306 is 60350866.

It is not an unprimeable number, because it can be changed into a prime (66805301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67890 + ... + 68866.

It is an arithmetic number, because the mean of its divisors is an integer number (6337440).

Almost surely, 2^66805306 is an apocalyptic number.

66805306 is a deficient number, since it is larger than the sum of its proper divisors (34593734).

66805306 is a wasteful number, since it uses less digits than its factorization.

66805306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 66805306 is about 8173.4512906116. The cubic root of 66805306 is about 405.7610158977.

The spelling of 66805306 in words is "sixty-six million, eight hundred five thousand, three hundred six".