205164542173194 has 24 divisors (see below), whose sum is σ = 444529143807840. Its totient is φ = 68387262401448.

The previous prime is 205164542173177. The next prime is 205164542173249. The reversal of 205164542173194 is 491371245461502.

205164542173194 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 6 + 4 + 542 + 1 + 7 + 3 + 1 + 94 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 205164542173194.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 75148534 + ... + 77830785.

It is an arithmetic number, because the mean of its divisors is an integer number (18522047658660).

Almost surely, 2^{205164542173194} is an apocalyptic number.

205164542173194 is an abundant number, since it is smaller than the sum of its proper divisors (239364601634646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205164542173194 is a wasteful number, since it uses less digits than its factorization.

205164542173194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153053834 (or 153053831 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 205164542173194 in words is "two hundred five trillion, one hundred sixty-four billion, five hundred forty-two million, one hundred seventy-three thousand, one hundred ninety-four".