6408768281 has 2 divisors, whose sum is σ = 6408768282. Its totient is φ = 6408768280.

The previous prime is 6408768263. The next prime is 6408768283. The reversal of 6408768281 is 1828678046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4279776400 + 2128991881 = 65420^2 + 46141^2 .

It is a cyclic number.

It is not a de Polignac number, because 6408768281 - 2⁶ = 6408768217 is a prime.

It is a super-2 number, since 2×6408768281² = 82144621759103389922, which contains 22 as substring.

Together with 6408768283, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6408768283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3204384140 + 3204384141.

It is an arithmetic number, because the mean of its divisors is an integer number (3204384141).

Almost surely, 2^6408768281 is an apocalyptic number.

It is an amenable number.

6408768281 is a deficient number, since it is larger than the sum of its proper divisors (1).

6408768281 is an equidigital number, since it uses as much as digits as its factorization.

6408768281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1032192, while the sum is 50.

The square root of 6408768281 is about 80054.7829988940. The cubic root of 6408768281 is about 1857.4830372566.

The spelling of 6408768281 in words is "six billion, four hundred eight million, seven hundred sixty-eight thousand, two hundred eighty-one".