205411740266 has 4 divisors (see below), whose sum is σ = 308117610402. Its totient is φ = 102705870132.

The previous prime is 205411740263. The next prime is 205411740283. The reversal of 205411740266 is 662047114502.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 662047114502 = 2 ⋅331023557251.

It can be written as a sum of positive squares in only one way, i.e., 159257663041 + 46154077225 = 399071^2 + 214835^2 .

It is not an unprimeable number, because it can be changed into a prime (205411740263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51352935065 + ... + 51352935068.

Almost surely, 2^205411740266 is an apocalyptic number.

205411740266 is a deficient number, since it is larger than the sum of its proper divisors (102705870136).

205411740266 is a wasteful number, since it uses less digits than its factorization.

205411740266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102705870135.

The product of its (nonzero) digits is 80640, while the sum is 38.

Adding to 205411740266 its reverse (662047114502), we get a palindrome (867458854768).

The spelling of 205411740266 in words is "two hundred five billion, four hundred eleven million, seven hundred forty thousand, two hundred sixty-six".