205161500266 has 4 divisors (see below), whose sum is σ = 307742250402. Its totient is φ = 102580750132.

The previous prime is 205161500249. The next prime is 205161500273. The reversal of 205161500266 is 662005161502.

205161500266 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 662005161502 = 2 ⋅331002580751.

It can be written as a sum of positive squares in only one way, i.e., 187420592241 + 17740908025 = 432921^2 + 133195^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51290375065 + ... + 51290375068.

Almost surely, 2^205161500266 is an apocalyptic number.

205161500266 is a deficient number, since it is larger than the sum of its proper divisors (102580750136).

205161500266 is a wasteful number, since it uses less digits than its factorization.

205161500266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102580750135.

The product of its (nonzero) digits is 21600, while the sum is 34.

Adding to 205161500266 its reverse (662005161502), we get a palindrome (867166661768).

The spelling of 205161500266 in words is "two hundred five billion, one hundred sixty-one million, five hundred thousand, two hundred sixty-six".