660555439 has 2 divisors, whose sum is σ = 660555440. Its totient is φ = 660555438.

The previous prime is 660555421. The next prime is 660555457. The reversal of 660555439 is 934555066.

It is a balanced prime because it is at equal distance from previous prime (660555421) and next prime (660555457).

It is a cyclic number.

It is not a de Polignac number, because 660555439 - 2⁹ = 660554927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 660555395 and 660555404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660550439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330277719 + 330277720.

It is an arithmetic number, because the mean of its divisors is an integer number (330277720).

Almost surely, 2^660555439 is an apocalyptic number.

660555439 is a deficient number, since it is larger than the sum of its proper divisors (1).

660555439 is an equidigital number, since it uses as much as digits as its factorization.

660555439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486000, while the sum is 43.

The square root of 660555439 is about 25701.2731007629. The cubic root of 660555439 is about 870.9029419650.

The spelling of 660555439 in words is "six hundred sixty million, five hundred fifty-five thousand, four hundred thirty-nine".