1969778966893 has 2 divisors, whose sum is σ = 1969778966894. Its totient is φ = 1969778966892.

The previous prime is 1969778966843. The next prime is 1969778966899. The reversal of 1969778966893 is 3986698779691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1385015935689 + 584763031204 = 1176867^2 + 764698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1969778966893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1969778966899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984889483446 + 984889483447.

It is an arithmetic number, because the mean of its divisors is an integer number (984889483447).

Almost surely, 2^{1969778966893} is an apocalyptic number.

It is an amenable number.

1969778966893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969778966893 is an equidigital number, since it uses as much as digits as its factorization.

1969778966893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13332791808, while the sum is 88.

The spelling of 1969778966893 in words is "one trillion, nine hundred sixty-nine billion, seven hundred seventy-eight million, nine hundred sixty-six thousand, eight hundred ninety-three".