664543303789 has 2 divisors, whose sum is σ = 664543303790. Its totient is φ = 664543303788.

The previous prime is 664543303679. The next prime is 664543303861. The reversal of 664543303789 is 987303345466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 612866648164 + 51676655625 = 782858^2 + 227325^2 .

It is a cyclic number.

It is not a de Polignac number, because 664543303789 - 2⁷ = 664543303661 is a prime.

It is a super-2 number, since 2×664543303789² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664543307789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332271651894 + 332271651895.

It is an arithmetic number, because the mean of its divisors is an integer number (332271651895).

Almost surely, 2^664543303789 is an apocalyptic number.

It is an amenable number.

664543303789 is a deficient number, since it is larger than the sum of its proper divisors (1).

664543303789 is an equidigital number, since it uses as much as digits as its factorization.

664543303789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39191040, while the sum is 58.

The spelling of 664543303789 in words is "six hundred sixty-four billion, five hundred forty-three million, three hundred three thousand, seven hundred eighty-nine".