206617760757021 has 16 divisors (see below), whose sum is σ = 275539605120000. Its totient is φ = 137720546035008.

The previous prime is 206617760757007. The next prime is 206617760757061. The reversal of 206617760757021 is 120757067716602.

It is not a de Polignac number, because 206617760757021 - 2¹⁰ = 206617760755997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206617760757061) 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 15 ways as a sum of consecutive naturals, for example, 1364377335 + ... + 1364528763.

It is an arithmetic number, because the mean of its divisors is an integer number (17221225320000).

Almost surely, 2^{206617760757021} is an apocalyptic number.

It is an amenable number.

206617760757021 is a deficient number, since it is larger than the sum of its proper divisors (68921844362979).

206617760757021 is a wasteful number, since it uses less digits than its factorization.

206617760757021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229748.

The product of its (nonzero) digits is 10372320, while the sum is 57.

The spelling of 206617760757021 in words is "two hundred six trillion, six hundred seventeen billion, seven hundred sixty million, seven hundred fifty-seven thousand, twenty-one".