664841403757 has 2 divisors, whose sum is σ = 664841403758. Its totient is φ = 664841403756.

The previous prime is 664841403749. The next prime is 664841403799. The reversal of 664841403757 is 757304148466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 475367501961 + 189473901796 = 689469^2 + 435286^2 .

It is a cyclic number.

It is not a de Polignac number, because 664841403757 - 2³ = 664841403749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664841403698 and 664841403707.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664841403727) 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, 332420701878 + 332420701879.

It is an arithmetic number, because the mean of its divisors is an integer number (332420701879).

Almost surely, 2^664841403757 is an apocalyptic number.

It is an amenable number.

664841403757 is a deficient number, since it is larger than the sum of its proper divisors (1).

664841403757 is an equidigital number, since it uses as much as digits as its factorization.

664841403757 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13547520, while the sum is 55.

The spelling of 664841403757 in words is "six hundred sixty-four billion, eight hundred forty-one million, four hundred three thousand, seven hundred fifty-seven".