205020055161 has 48 divisors (see below), whose sum is σ = 316478822400. Its totient is φ = 127527208704.

The previous prime is 205020055157. The next prime is 205020055193. The reversal of 205020055161 is 161550020502.

205020055161 is a `hidden beast` number, since 2 + 0 + 50 + 2 + 0 + 0 + 551 + 61 = 666.

It is not a de Polignac number, because 205020055161 - 2² = 205020055157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205020055061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2940775 + ... + 3009683.

It is an arithmetic number, because the mean of its divisors is an integer number (6593308800).

Almost surely, 2^205020055161 is an apocalyptic number.

It is an amenable number.

205020055161 is a deficient number, since it is larger than the sum of its proper divisors (111458767239).

205020055161 is a wasteful number, since it uses less digits than its factorization.

205020055161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69198 (or 69195 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 205020055161 its reverse (161550020502), we get a palindrome (366570075663).

The spelling of 205020055161 in words is "two hundred five billion, twenty million, fifty-five thousand, one hundred sixty-one".