665365369 has 8 divisors (see below), whose sum is σ = 698090240. Its totient is φ = 633344400.

The previous prime is 665365303. The next prime is 665365381. The reversal of 665365369 is 963563566.

It is a happy number.

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 665365369 - 2¹⁹ = 664841081 is a prime.

It is a super-2 number, since 2×665365369² = 885422148529012322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665365969) 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 7 ways as a sum of consecutive naturals, for example, 174039 + ... + 177820.

It is an arithmetic number, because the mean of its divisors is an integer number (87261280).

Almost surely, 2^665365369 is an apocalyptic number.

It is an amenable number.

665365369 is a deficient number, since it is larger than the sum of its proper divisors (32724871).

665365369 is a wasteful number, since it uses less digits than its factorization.

665365369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351951.

The product of its digits is 2624400, while the sum is 49.

The square root of 665365369 is about 25794.6771447134. The cubic root of 665365369 is about 873.0117003996.

The spelling of 665365369 in words is "six hundred sixty-five million, three hundred sixty-five thousand, three hundred sixty-nine".