664841403727 has 2 divisors, whose sum is σ = 664841403728. Its totient is φ = 664841403726.

The previous prime is 664841403703. The next prime is 664841403731. The reversal of 664841403727 is 727304148466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664841403727 - 2³¹ = 662693920079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664841403757) 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, 332420701863 + 332420701864.

It is an arithmetic number, because the mean of its divisors is an integer number (332420701864).

Almost surely, 2^664841403727 is an apocalyptic number.

664841403727 is a deficient number, since it is larger than the sum of its proper divisors (1).

664841403727 is an equidigital number, since it uses as much as digits as its factorization.

664841403727 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5419008, while the sum is 52.

The spelling of 664841403727 in words is "six hundred sixty-four billion, eight hundred forty-one million, four hundred three thousand, seven hundred twenty-seven".