329590661 has 2 divisors, whose sum is σ = 329590662. Its totient is φ = 329590660.

The previous prime is 329590637. The next prime is 329590691. The reversal of 329590661 is 166095923.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 312936100 + 16654561 = 17690^2 + 4081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-329590661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (329590631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164795330 + 164795331.

It is an arithmetic number, because the mean of its divisors is an integer number (164795331).

Almost surely, 2^329590661 is an apocalyptic number.

It is an amenable number.

329590661 is a deficient number, since it is larger than the sum of its proper divisors (1).

329590661 is an equidigital number, since it uses as much as digits as its factorization.

329590661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 329590661 is about 18154.6319433912. The cubic root of 329590661 is about 690.7564769267.

The spelling of 329590661 in words is "three hundred twenty-nine million, five hundred ninety thousand, six hundred sixty-one".