6395906404781 has 2 divisors, whose sum is σ = 6395906404782. Its totient is φ = 6395906404780.

The previous prime is 6395906404751. The next prime is 6395906404819. The reversal of 6395906404781 is 1874046095936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5113952574025 + 1281953830756 = 2261405^2 + 1132234^2 .

It is a cyclic number.

It is not a de Polignac number, because 6395906404781 - 2¹⁴ = 6395906388397 is a prime.

It is a super-2 number, since 2×6395906404781² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6395906404751) 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, 3197953202390 + 3197953202391.

It is an arithmetic number, because the mean of its divisors is an integer number (3197953202391).

Almost surely, 2^{6395906404781} is an apocalyptic number.

It is an amenable number.

6395906404781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6395906404781 is an equidigital number, since it uses as much as digits as its factorization.

6395906404781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39191040, while the sum is 62.

The spelling of 6395906404781 in words is "six trillion, three hundred ninety-five billion, nine hundred six million, four hundred four thousand, seven hundred eighty-one".