204177340161 has 6 divisors (see below), whose sum is σ = 294922824690. Its totient is φ = 136118226768.

The previous prime is 204177340121. The next prime is 204177340177. The reversal of 204177340161 is 161043771402.

204177340161 is a `hidden beast` number, since 20 + 4 + 177 + 3 + 401 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 154590512400 + 49586827761 = 393180^2 + 222681^2 .

It is a de Polignac number, because none of the positive numbers 2^k-204177340161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (204177340121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11343185556 + ... + 11343185573.

It is an arithmetic number, because the mean of its divisors is an integer number (49153804115).

Almost surely, 2^204177340161 is an apocalyptic number.

It is an amenable number.

204177340161 is a deficient number, since it is larger than the sum of its proper divisors (90745484529).

204177340161 is a wasteful number, since it uses less digits than its factorization.

204177340161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22686371135 (or 22686371132 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The spelling of 204177340161 in words is "two hundred four billion, one hundred seventy-seven million, three hundred forty thousand, one hundred sixty-one".