1969778966593 has 2 divisors, whose sum is σ = 1969778966594. Its totient is φ = 1969778966592.

The previous prime is 1969778966569. The next prime is 1969778966621. The reversal of 1969778966593 is 3956698779691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1079722575409 + 890056391184 = 1039097^2 + 943428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1969778966593 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1969778966593.

It is not a weakly prime, because it can be changed into another prime (1969778966093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984889483296 + 984889483297.

It is an arithmetic number, because the mean of its divisors is an integer number (984889483297).

Almost surely, 2^{1969778966593} is an apocalyptic number.

It is an amenable number.

1969778966593 is a deficient number, since it is larger than the sum of its proper divisors (1).

1969778966593 is an equidigital number, since it uses as much as digits as its factorization.

1969778966593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8332994880, while the sum is 85.

The spelling of 1969778966593 in words is "one trillion, nine hundred sixty-nine billion, seven hundred seventy-eight million, nine hundred sixty-six thousand, five hundred ninety-three".