665760711 has 16 divisors (see below), whose sum is σ = 1106719488. Its totient is φ = 345849600.

The previous prime is 665760707. The next prime is 665760731. The reversal of 665760711 is 117067566.

It is not a de Polignac number, because 665760711 - 2² = 665760707 is a prime.

It is a super-2 number, since 2×665760711² = 886474648622451042, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 665760711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665760731) 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 15 ways as a sum of consecutive naturals, for example, 1440810 + ... + 1441271.

It is an arithmetic number, because the mean of its divisors is an integer number (69169968).

Almost surely, 2^665760711 is an apocalyptic number.

665760711 is a deficient number, since it is larger than the sum of its proper divisors (440958777).

665760711 is a wasteful number, since it uses less digits than its factorization.

665760711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2882102.

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 665760711 is about 25802.3392544164. The cubic root of 665760711 is about 873.1845727657.

The spelling of 665760711 in words is "six hundred sixty-five million, seven hundred sixty thousand, seven hundred eleven".