66289207 has 4 divisors (see below), whose sum is σ = 66397960. Its totient is φ = 66180456.

The previous prime is 66289193. The next prime is 66289213. The reversal of 66289207 is 70298266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66289207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66289207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66289217) 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 3 ways as a sum of consecutive naturals, for example, 53457 + ... + 54682.

It is an arithmetic number, because the mean of its divisors is an integer number (16599490).

Almost surely, 2^66289207 is an apocalyptic number.

66289207 is a deficient number, since it is larger than the sum of its proper divisors (108753).

66289207 is a wasteful number, since it uses less digits than its factorization.

66289207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108752.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 66289207 is about 8141.8184086849. The cubic root of 66289207 is about 404.7134222211.

The spelling of 66289207 in words is "sixty-six million, two hundred eighty-nine thousand, two hundred seven".