206561768267 has 12 divisors (see below), whose sum is σ = 219444879576. Its totient is φ = 194395418880.

The previous prime is 206561768263. The next prime is 206561768291. The reversal of 206561768267 is 762867165602.

It is not a de Polignac number, because 206561768267 - 2² = 206561768263 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206561768263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5217248 + ... + 5256690.

It is an arithmetic number, because the mean of its divisors is an integer number (18287073298).

Almost surely, 2^206561768267 is an apocalyptic number.

206561768267 is a deficient number, since it is larger than the sum of its proper divisors (12883111309).

206561768267 is a wasteful number, since it uses less digits than its factorization.

206561768267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57598 (or 57581 counting only the distinct ones).

The product of its (nonzero) digits is 10160640, while the sum is 56.

The spelling of 206561768267 in words is "two hundred six billion, five hundred sixty-one million, seven hundred sixty-eight thousand, two hundred sixty-seven".