3993345649 has 2 divisors, whose sum is σ = 3993345650. Its totient is φ = 3993345648.

The previous prime is 3993345607. The next prime is 3993345661. The reversal of 3993345649 is 9465433993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3548346624 + 444999025 = 59568^2 + 21095^2 .

It is an emirp because it is prime and its reverse (9465433993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3993345649 - 2¹³ = 3993337457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3993345649.

It is not a weakly prime, because it can be changed into another prime (3993345749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1996672824 + 1996672825.

It is an arithmetic number, because the mean of its divisors is an integer number (1996672825).

Almost surely, 2^3993345649 is an apocalyptic number.

It is an amenable number.

3993345649 is a deficient number, since it is larger than the sum of its proper divisors (1).

3993345649 is an equidigital number, since it uses as much as digits as its factorization.

3993345649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9447840, while the sum is 55.

The square root of 3993345649 is about 63192.9240421742. The cubic root of 3993345649 is about 1586.5203030717.

The spelling of 3993345649 in words is "three billion, nine hundred ninety-three million, three hundred forty-five thousand, six hundred forty-nine".