649169807393 has 2 divisors, whose sum is σ = 649169807394. Its totient is φ = 649169807392.

The previous prime is 649169807389. The next prime is 649169807483. The reversal of 649169807393 is 393708961946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 619505945569 + 29663861824 = 787087^2 + 172232^2 .

It is a cyclic number.

It is not a de Polignac number, because 649169807393 - 2² = 649169807389 is a prime.

It is not a weakly prime, because it can be changed into another prime (649169807303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324584903696 + 324584903697.

It is an arithmetic number, because the mean of its divisors is an integer number (324584903697).

Almost surely, 2^649169807393 is an apocalyptic number.

It is an amenable number.

649169807393 is a deficient number, since it is larger than the sum of its proper divisors (1).

649169807393 is an equidigital number, since it uses as much as digits as its factorization.

649169807393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52907904, while the sum is 65.

The spelling of 649169807393 in words is "six hundred forty-nine billion, one hundred sixty-nine million, eight hundred seven thousand, three hundred ninety-three".