330640561 has 2 divisors, whose sum is σ = 330640562. Its totient is φ = 330640560.

The previous prime is 330640559. The next prime is 330640589. The reversal of 330640561 is 165046033.

It is an a-pointer prime, because the next prime (330640589) can be obtained adding 330640561 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250430625 + 80209936 = 15825^2 + 8956^2 .

It is a cyclic number.

It is not a de Polignac number, because 330640561 - 2¹ = 330640559 is a prime.

Together with 330640559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (330640061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165320280 + 165320281.

It is an arithmetic number, because the mean of its divisors is an integer number (165320281).

Almost surely, 2^330640561 is an apocalyptic number.

It is an amenable number.

330640561 is a deficient number, since it is larger than the sum of its proper divisors (1).

330640561 is an equidigital number, since it uses as much as digits as its factorization.

330640561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 330640561 is about 18183.5244383480. The cubic root of 330640561 is about 691.4891600298.

Adding to 330640561 its reverse (165046033), we get a palindrome (495686594).

The spelling of 330640561 in words is "three hundred thirty million, six hundred forty thousand, five hundred sixty-one".