199049807549 has 4 divisors (see below), whose sum is σ = 199060984764. Its totient is φ = 199038630336.

The previous prime is 199049807503. The next prime is 199049807563. The reversal of 199049807549 is 945708940991.

199049807549 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 146313900100 + 52735907449 = 382510^2 + 229643^2 .

It is a cyclic number.

It is not a de Polignac number, because 199049807549 - 2¹² = 199049803453 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 (199049807569) 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 3 ways as a sum of consecutive naturals, for example, 5561852 + ... + 5597525.

It is an arithmetic number, because the mean of its divisors is an integer number (49765246191).

Almost surely, 2^199049807549 is an apocalyptic number.

It is an amenable number.

199049807549 is a deficient number, since it is larger than the sum of its proper divisors (11177215).

199049807549 is a wasteful number, since it uses less digits than its factorization.

199049807549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11177214.

The product of its (nonzero) digits is 29393280, while the sum is 65.

The spelling of 199049807549 in words is "one hundred ninety-nine billion, forty-nine million, eight hundred seven thousand, five hundred forty-nine".