660344425591 has 2 divisors, whose sum is σ = 660344425592. Its totient is φ = 660344425590.

The previous prime is 660344425567. The next prime is 660344425607. The reversal of 660344425591 is 195524443066.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 660344425591 - 2⁷ = 660344425463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660344425501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330172212795 + 330172212796.

It is an arithmetic number, because the mean of its divisors is an integer number (330172212796).

Almost surely, 2^660344425591 is an apocalyptic number.

660344425591 is a deficient number, since it is larger than the sum of its proper divisors (1).

660344425591 is an equidigital number, since it uses as much as digits as its factorization.

660344425591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 660344425591 in words is "six hundred sixty billion, three hundred forty-four million, four hundred twenty-five thousand, five hundred ninety-one".