6420818263 has 2 divisors, whose sum is σ = 6420818264. Its totient is φ = 6420818262.

The previous prime is 6420818251. The next prime is 6420818269. The reversal of 6420818263 is 3628180246.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6420818263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6420818269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3210409131 + 3210409132.

It is an arithmetic number, because the mean of its divisors is an integer number (3210409132).

Almost surely, 2^6420818263 is an apocalyptic number.

6420818263 is a deficient number, since it is larger than the sum of its proper divisors (1).

6420818263 is an equidigital number, since it uses as much as digits as its factorization.

6420818263 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 6420818263 is about 80130.0085049290. The cubic root of 6420818263 is about 1858.6464757741.

The spelling of 6420818263 in words is "six billion, four hundred twenty million, eight hundred eighteen thousand, two hundred sixty-three".