199810544957 has 2 divisors, whose sum is σ = 199810544958. Its totient is φ = 199810544956.

The previous prime is 199810544953. The next prime is 199810545001. The reversal of 199810544957 is 759445018991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118570724281 + 81239820676 = 344341^2 + 285026^2 .

It is an emirp because it is prime and its reverse (759445018991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 199810544957 - 2² = 199810544953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199810544957.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199810544953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99905272478 + 99905272479.

It is an arithmetic number, because the mean of its divisors is an integer number (99905272479).

Almost surely, 2^199810544957 is an apocalyptic number.

It is an amenable number.

199810544957 is a deficient number, since it is larger than the sum of its proper divisors (1).

199810544957 is an equidigital number, since it uses as much as digits as its factorization.

199810544957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16329600, while the sum is 62.

The spelling of 199810544957 in words is "one hundred ninety-nine billion, eight hundred ten million, five hundred forty-four thousand, nine hundred fifty-seven".