320666965 has 16 divisors (see below), whose sum is σ = 390076848. Its totient is φ = 253034496.

The previous prime is 320666963. The next prime is 320666977. The reversal of 320666965 is 569666023.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 61811044 + 258855921 = 7862^2 + 16089^2 .

It is a cyclic number.

It is not a de Polignac number, because 320666965 - 2¹ = 320666963 is a prime.

It is a super-2 number, since 2×320666965² = 205654604884622450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320666963) 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 15 ways as a sum of consecutive naturals, for example, 170269 + ... + 172141.

It is an arithmetic number, because the mean of its divisors is an integer number (24379803).

Almost surely, 2^320666965 is an apocalyptic number.

It is an amenable number.

320666965 is a deficient number, since it is larger than the sum of its proper divisors (69409883).

320666965 is a wasteful number, since it uses less digits than its factorization.

320666965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 349920, while the sum is 43.

The square root of 320666965 is about 17907.1763547467. The cubic root of 320666965 is about 684.4652547787.

The spelling of 320666965 in words is "three hundred twenty million, six hundred sixty-six thousand, nine hundred sixty-five".