206443203261 has 16 divisors (see below), whose sum is σ = 281713749504. Its totient is φ = 134401975344.

The previous prime is 206443203257. The next prime is 206443203283. The reversal of 206443203261 is 162302344602.

It is not a de Polignac number, because 206443203261 - 2² = 206443203257 is a prime.

It is a super-2 number, since 2×206443203261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206443203251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521200 + ... + 827366.

It is an arithmetic number, because the mean of its divisors is an integer number (17607109344).

Almost surely, 2^206443203261 is an apocalyptic number.

It is an amenable number.

206443203261 is a deficient number, since it is larger than the sum of its proper divisors (75270546243).

206443203261 is a wasteful number, since it uses less digits than its factorization.

206443203261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311440.

The product of its (nonzero) digits is 41472, while the sum is 33.

Adding to 206443203261 its reverse (162302344602), we get a palindrome (368745547863).

The spelling of 206443203261 in words is "two hundred six billion, four hundred forty-three million, two hundred three thousand, two hundred sixty-one".