205198441986909 has 16 divisors (see below), whose sum is σ = 329140358074880. Its totient is φ = 111084870849840.

The previous prime is 205198441986823. The next prime is 205198441986911. The reversal of 205198441986909 is 909689144891502.

It is not a de Polignac number, because 205198441986909 - 2⁷ = 205198441986781 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 (205198441986929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 257140904347 + ... + 257140905144.

It is an arithmetic number, because the mean of its divisors is an integer number (20571272379680).

Almost surely, 2^{205198441986909} is an apocalyptic number.

It is an amenable number.

205198441986909 is a deficient number, since it is larger than the sum of its proper divisors (123941916087971).

205198441986909 is a wasteful number, since it uses less digits than its factorization.

205198441986909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514281809520.

The product of its (nonzero) digits is 403107840, while the sum is 75.

The spelling of 205198441986909 in words is "two hundred five trillion, one hundred ninety-eight billion, four hundred forty-one million, nine hundred eighty-six thousand, nine hundred nine".