665343361 has 8 divisors (see below), whose sum is σ = 683648424. Its totient is φ = 647055360.

The previous prime is 665343353. The next prime is 665343373. The reversal of 665343361 is 163343566.

It can be written as a sum of positive squares in 4 ways, for example, as 444999025 + 220344336 = 21095^2 + 14844^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 665343361 - 2³ = 665343353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

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 665343361.

It is not an unprimeable number, because it can be changed into a prime (665343461) 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 7 ways as a sum of consecutive naturals, for example, 146241 + ... + 150721.

It is an arithmetic number, because the mean of its divisors is an integer number (85456053).

Almost surely, 2^665343361 is an apocalyptic number.

It is an amenable number.

665343361 is a deficient number, since it is larger than the sum of its proper divisors (18305063).

665343361 is a wasteful number, since it uses less digits than its factorization.

665343361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8531.

The product of its digits is 116640, while the sum is 37.

The square root of 665343361 is about 25794.2505415451. The cubic root of 665343361 is about 873.0020748844.

The spelling of 665343361 in words is "six hundred sixty-five million, three hundred forty-three thousand, three hundred sixty-one".