6420978763 has 2 divisors, whose sum is σ = 6420978764. Its totient is φ = 6420978762.

The previous prime is 6420978737. The next prime is 6420978857. The reversal of 6420978763 is 3678790246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6420978763 - 2²¹ = 6418881611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6420978763.

It is not a weakly prime, because it can be changed into another prime (6420975763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210489381 + 3210489382.

It is an arithmetic number, because the mean of its divisors is an integer number (3210489382).

Almost surely, 2^6420978763 is an apocalyptic number.

6420978763 is a deficient number, since it is larger than the sum of its proper divisors (1).

6420978763 is an equidigital number, since it uses as much as digits as its factorization.

6420978763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3048192, while the sum is 52.

The square root of 6420978763 is about 80131.0099961307. The cubic root of 6420978763 is about 1858.6619623918.

The spelling of 6420978763 in words is "six billion, four hundred twenty million, nine hundred seventy-eight thousand, seven hundred sixty-three".