1966975690189 has 2 divisors, whose sum is σ = 1966975690190. Its totient is φ = 1966975690188.

The previous prime is 1966975690151. The next prime is 1966975690193. The reversal of 1966975690189 is 9810965796691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1965463802500 + 1511887689 = 1401950^2 + 38883^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966975690189 - 2¹⁵ = 1966975657421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966975690129) 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, 983487845094 + 983487845095.

It is an arithmetic number, because the mean of its divisors is an integer number (983487845095).

Almost surely, 2^{1966975690189} is an apocalyptic number.

It is an amenable number.

1966975690189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966975690189 is an equidigital number, since it uses as much as digits as its factorization.

1966975690189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 396809280, while the sum is 76.

The spelling of 1966975690189 in words is "one trillion, nine hundred sixty-six billion, nine hundred seventy-five million, six hundred ninety thousand, one hundred eighty-nine".