660032591 has 2 divisors, whose sum is σ = 660032592. Its totient is φ = 660032590.

The previous prime is 660032579. The next prime is 660032623. The reversal of 660032591 is 195230066.

It is a happy number.

It is an a-pointer prime, because the next prime (660032623) can be obtained adding 660032591 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660032591 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660032551) 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 as a sum of consecutive naturals, namely, 330016295 + 330016296.

It is an arithmetic number, because the mean of its divisors is an integer number (330016296).

Almost surely, 2^660032591 is an apocalyptic number.

660032591 is a deficient number, since it is larger than the sum of its proper divisors (1).

660032591 is an equidigital number, since it uses as much as digits as its factorization.

660032591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 660032591 is about 25691.0994509772. The cubic root of 660032591 is about 870.6731000128.

The spelling of 660032591 in words is "six hundred sixty million, thirty-two thousand, five hundred ninety-one".