206401266 has 12 divisors (see below), whose sum is σ = 447202782. Its totient is φ = 68800416.

The previous prime is 206401249. The next prime is 206401271. The reversal of 206401266 is 662104602.

It is a happy number.

206401266 is a `hidden beast` number, since 2 + 0 + 640 + 12 + 6 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 206066025 + 335241 = 14355^2 + 579^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5733351 + ... + 5733386.

Almost surely, 2^206401266 is an apocalyptic number.

206401266 is an abundant number, since it is smaller than the sum of its proper divisors (240801516).

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

206401266 is a wasteful number, since it uses less digits than its factorization.

206401266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11466745 (or 11466742 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 206401266 is about 14366.6720572302. The cubic root of 206401266 is about 590.9772810286.

Adding to 206401266 its reverse (662104602), we get a palindrome (868505868).

The spelling of 206401266 in words is "two hundred six million, four hundred one thousand, two hundred sixty-six".