197140644817 has 2 divisors, whose sum is σ = 197140644818. Its totient is φ = 197140644816.

The previous prime is 197140644787. The next prime is 197140644853. The reversal of 197140644817 is 718446041791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194700680001 + 2439964816 = 441249^2 + 49396^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197140644817 is a prime.

It is not a weakly prime, because it can be changed into another prime (197140644887) 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, 98570322408 + 98570322409.

It is an arithmetic number, because the mean of its divisors is an integer number (98570322409).

Almost surely, 2^197140644817 is an apocalyptic number.

It is an amenable number.

197140644817 is a deficient number, since it is larger than the sum of its proper divisors (1).

197140644817 is an equidigital number, since it uses as much as digits as its factorization.

197140644817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 52.

The spelling of 197140644817 in words is "one hundred ninety-seven billion, one hundred forty million, six hundred forty-four thousand, eight hundred seventeen".