660960322691 has 2 divisors, whose sum is σ = 660960322692. Its totient is φ = 660960322690.

The previous prime is 660960322621. The next prime is 660960322699. The reversal of 660960322691 is 196223069066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660960322691 - 2¹⁰ = 660960321667 is a prime.

It is not a weakly prime, because it can be changed into another prime (660960322699) 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, 330480161345 + 330480161346.

It is an arithmetic number, because the mean of its divisors is an integer number (330480161346).

Almost surely, 2^660960322691 is an apocalyptic number.

660960322691 is a deficient number, since it is larger than the sum of its proper divisors (1).

660960322691 is an equidigital number, since it uses as much as digits as its factorization.

660960322691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 50.

The spelling of 660960322691 in words is "six hundred sixty billion, nine hundred sixty million, three hundred twenty-two thousand, six hundred ninety-one".