665066207 has 24 divisors (see below), whose sum is σ = 752059728. Its totient is φ = 587308800.

The previous prime is 665066203. The next prime is 665066209. The reversal of 665066207 is 702660566.

It is not a de Polignac number, because 665066207 - 2² = 665066203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665066201) 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 23 ways as a sum of consecutive naturals, for example, 366332 + ... + 368142.

It is an arithmetic number, because the mean of its divisors is an integer number (31335822).

Almost surely, 2^665066207 is an apocalyptic number.

665066207 is a deficient number, since it is larger than the sum of its proper divisors (86993521).

665066207 is a wasteful number, since it uses less digits than its factorization.

665066207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1931 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 665066207 is about 25788.8775831753. The cubic root of 665066207 is about 872.8808394265.

The spelling of 665066207 in words is "six hundred sixty-five million, sixty-six thousand, two hundred seven".