664474137653 has 2 divisors, whose sum is σ = 664474137654. Its totient is φ = 664474137652.

The previous prime is 664474137491. The next prime is 664474137697. The reversal of 664474137653 is 356731474466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 458392640209 + 206081497444 = 677047^2 + 453962^2 .

It is a cyclic number.

It is not a de Polignac number, because 664474137653 - 2¹⁰ = 664474136629 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664474137253) 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, 332237068826 + 332237068827.

It is an arithmetic number, because the mean of its divisors is an integer number (332237068827).

Almost surely, 2^664474137653 is an apocalyptic number.

It is an amenable number.

664474137653 is a deficient number, since it is larger than the sum of its proper divisors (1).

664474137653 is an equidigital number, since it uses as much as digits as its factorization.

664474137653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30481920, while the sum is 56.

The spelling of 664474137653 in words is "six hundred sixty-four billion, four hundred seventy-four million, one hundred thirty-seven thousand, six hundred fifty-three".