199057756717 has 4 divisors (see below), whose sum is σ = 203912823996. Its totient is φ = 194202689440.

The previous prime is 199057756661. The next prime is 199057756721. The reversal of 199057756717 is 717657750991.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26557917156 + 172499839561 = 162966^2 + 415331^2 .

It is a cyclic number.

It is not a de Polignac number, because 199057756717 - 2¹¹ = 199057754669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199057756517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2427533578 + ... + 2427533659.

It is an arithmetic number, because the mean of its divisors is an integer number (50978205999).

Almost surely, 2^199057756717 is an apocalyptic number.

It is an amenable number.

199057756717 is a deficient number, since it is larger than the sum of its proper divisors (4855067279).

199057756717 is an equidigital number, since it uses as much as digits as its factorization.

199057756717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4855067278.

The product of its (nonzero) digits is 29172150, while the sum is 64.

The spelling of 199057756717 in words is "one hundred ninety-nine billion, fifty-seven million, seven hundred fifty-six thousand, seven hundred seventeen".