206220571661223 has 36 divisors (see below), whose sum is σ = 346946963439960. Its totient is φ = 117690592886496.

The previous prime is 206220571661213. The next prime is 206220571661243. The reversal of 206220571661223 is 322166175022602.

206220571661223 is a `hidden beast` number, since 2 + 0 + 6 + 2 + 2 + 0 + 5 + 7 + 1 + 6 + 612 + 23 = 666.

It is not a de Polignac number, because 206220571661223 - 2¹² = 206220571657127 is a prime.

It is a super-2 number, since 2×206220571661223² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206220571661213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 296743368 + ... + 297437501.

It is an arithmetic number, because the mean of its divisors is an integer number (9637415651110).

Almost surely, 2^{206220571661223} is an apocalyptic number.

206220571661223 is a deficient number, since it is larger than the sum of its proper divisors (140726391778737).

206220571661223 is a wasteful number, since it uses less digits than its factorization.

206220571661223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594181676 (or 594181666 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 206220571661223 in words is "two hundred six trillion, two hundred twenty billion, five hundred seventy-one million, six hundred sixty-one thousand, two hundred twenty-three".