6428805140861 has 2 divisors, whose sum is σ = 6428805140862. Its totient is φ = 6428805140860.

The previous prime is 6428805140843. The next prime is 6428805140873. The reversal of 6428805140861 is 1680415088246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6420775905625 + 8029235236 = 2533925^2 + 89606^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6428805140861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6428805130861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3214402570430 + 3214402570431.

It is an arithmetic number, because the mean of its divisors is an integer number (3214402570431).

Almost surely, 2^{6428805140861} is an apocalyptic number.

It is an amenable number.

6428805140861 is a deficient number, since it is larger than the sum of its proper divisors (1).

6428805140861 is an equidigital number, since it uses as much as digits as its factorization.

6428805140861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2949120, while the sum is 53.

The spelling of 6428805140861 in words is "six trillion, four hundred twenty-eight billion, eight hundred five million, one hundred forty thousand, eight hundred sixty-one".