66806207 has 6 divisors (see below), whose sum is σ = 72340632. Its totient is φ = 61667112.

The previous prime is 66806197. The next prime is 66806213. The reversal of 66806207 is 70260866.

It is not a de Polignac number, because 66806207 - 2¹⁴ = 66789823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66808207) 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 5 ways as a sum of consecutive naturals, for example, 197483 + ... + 197820.

It is an arithmetic number, because the mean of its divisors is an integer number (12056772).

Almost surely, 2^66806207 is an apocalyptic number.

66806207 is a deficient number, since it is larger than the sum of its proper divisors (5534425).

66806207 is a wasteful number, since it uses less digits than its factorization.

66806207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395329 (or 395316 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 66806207 is about 8173.5064079011. The cubic root of 66806207 is about 405.7628400493.

The spelling of 66806207 in words is "sixty-six million, eight hundred six thousand, two hundred seven".