664733337517 has 2 divisors, whose sum is σ = 664733337518. Its totient is φ = 664733337516.

The previous prime is 664733337421. The next prime is 664733337533. The reversal of 664733337517 is 715733337466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 664259230441 + 474107076 = 815021^2 + 21774^2 .

It is a cyclic number.

It is not a de Polignac number, because 664733337517 - 2³⁹ = 114977523629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664733337577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332366668758 + 332366668759.

It is an arithmetic number, because the mean of its divisors is an integer number (332366668759).

Almost surely, 2^664733337517 is an apocalyptic number.

It is an amenable number.

664733337517 is a deficient number, since it is larger than the sum of its proper divisors (1).

664733337517 is an equidigital number, since it uses as much as digits as its factorization.

664733337517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20003760, while the sum is 55.

The spelling of 664733337517 in words is "six hundred sixty-four billion, seven hundred thirty-three million, three hundred thirty-seven thousand, five hundred seventeen".