1969778966843 has 2 divisors, whose sum is σ = 1969778966844. Its totient is φ = 1969778966842.

The previous prime is 1969778966839. The next prime is 1969778966893. The reversal of 1969778966843 is 3486698779691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1969778966843 - 2² = 1969778966839 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1969778966893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984889483421 + 984889483422.

It is an arithmetic number, because the mean of its divisors is an integer number (984889483422).

Almost surely, 2^{1969778966843} is an apocalyptic number.

1969778966843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969778966843 is an equidigital number, since it uses as much as digits as its factorization.

1969778966843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5925685248, while the sum is 83.

The spelling of 1969778966843 in words is "one trillion, nine hundred sixty-nine billion, seven hundred seventy-eight million, nine hundred sixty-six thousand, eight hundred forty-three".