665067607 has 4 divisors (see below), whose sum is σ = 666153160. Its totient is φ = 663982056.

The previous prime is 665067577. The next prime is 665067677. The reversal of 665067607 is 706760566.

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

It is a cyclic number.

It is not a de Polignac number, because 665067607 - 2¹¹ = 665065559 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 (665067677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541857 + ... + 543082.

It is an arithmetic number, because the mean of its divisors is an integer number (166538290).

Almost surely, 2^665067607 is an apocalyptic number.

665067607 is a deficient number, since it is larger than the sum of its proper divisors (1085553).

665067607 is a wasteful number, since it uses less digits than its factorization.

665067607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085552.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 665067607 is about 25788.9047266455. The cubic root of 665067607 is about 872.8814519131.

The spelling of 665067607 in words is "six hundred sixty-five million, sixty-seven thousand, six hundred seven".