6402663749 has 2 divisors, whose sum is σ = 6402663750. Its totient is φ = 6402663748.

The previous prime is 6402663739. The next prime is 6402663763. The reversal of 6402663749 is 9473662046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6010900900 + 391762849 = 77530^2 + 19793^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6402663749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6402663739) 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, 3201331874 + 3201331875.

It is an arithmetic number, because the mean of its divisors is an integer number (3201331875).

Almost surely, 2^6402663749 is an apocalyptic number.

It is an amenable number.

6402663749 is a deficient number, since it is larger than the sum of its proper divisors (1).

6402663749 is an equidigital number, since it uses as much as digits as its factorization.

6402663749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 47.

The square root of 6402663749 is about 80016.6466992963. The cubic root of 6402663749 is about 1856.8930816256.

The spelling of 6402663749 in words is "six billion, four hundred two million, six hundred sixty-three thousand, seven hundred forty-nine".