665871143 has 6 divisors (see below), whose sum is σ = 774584856. Its totient is φ = 570746652.

The previous prime is 665871097. The next prime is 665871197. The reversal of 665871143 is 341178566.

665871143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665871143 - 2¹⁶ = 665805607 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 665871143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665871743) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6794555 + ... + 6794652.

It is an arithmetic number, because the mean of its divisors is an integer number (129097476).

Almost surely, 2^665871143 is an apocalyptic number.

665871143 is a deficient number, since it is larger than the sum of its proper divisors (108713713).

665871143 is a wasteful number, since it uses less digits than its factorization.

665871143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13589221 (or 13589214 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 665871143 is about 25804.4791266943. The cubic root of 665871143 is about 873.2328494643.

The spelling of 665871143 in words is "six hundred sixty-five million, eight hundred seventy-one thousand, one hundred forty-three".