199810544977 has 16 divisors (see below), whose sum is σ = 213183539712. Its totient is φ = 186837544960.

The previous prime is 199810544957. The next prime is 199810545001. The reversal of 199810544977 is 779445018991.

It is a happy number.

199810544977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 199810544977 - 2⁷ = 199810544849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199810544957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 818577 + ... + 1034257.

It is an arithmetic number, because the mean of its divisors is an integer number (13323971232).

Almost surely, 2^199810544977 is an apocalyptic number.

It is an amenable number.

199810544977 is a deficient number, since it is larger than the sum of its proper divisors (13372994735).

199810544977 is a wasteful number, since it uses less digits than its factorization.

199810544977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216608.

The product of its (nonzero) digits is 22861440, while the sum is 64.

The spelling of 199810544977 in words is "one hundred ninety-nine billion, eight hundred ten million, five hundred forty-four thousand, nine hundred seventy-seven".