6194777443781 has 2 divisors, whose sum is σ = 6194777443782. Its totient is φ = 6194777443780.

The previous prime is 6194777443741. The next prime is 6194777443783. The reversal of 6194777443781 is 1873447774916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5401947475681 + 792829968100 = 2324209^2 + 890410^2 .

It is a cyclic number.

It is not a de Polignac number, because 6194777443781 - 2⁶ = 6194777443717 is a prime.

It is a super-2 number, since 2×6194777443781² (a number of 26 digits) contains 22 as substring.

Together with 6194777443783, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6194777443783) 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, 3097388721890 + 3097388721891.

It is an arithmetic number, because the mean of its divisors is an integer number (3097388721891).

Almost surely, 2^{6194777443781} is an apocalyptic number.

It is an amenable number.

6194777443781 is a deficient number, since it is larger than the sum of its proper divisors (1).

6194777443781 is an equidigital number, since it uses as much as digits as its factorization.

6194777443781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 199148544, while the sum is 68.

The spelling of 6194777443781 in words is "six trillion, one hundred ninety-four billion, seven hundred seventy-seven million, four hundred forty-three thousand, seven hundred eighty-one".