210205656166 has 64 divisors (see below), whose sum is σ = 365949757440. Its totient is φ = 89498304000.

The previous prime is 210205656163. The next prime is 210205656197. The reversal of 210205656166 is 661656502012.

210205656166 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×210205656166² (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 (210205656163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77308555 + ... + 77311273.

It is an arithmetic number, because the mean of its divisors is an integer number (5717964960).

Almost surely, 2^210205656166 is an apocalyptic number.

210205656166 is a deficient number, since it is larger than the sum of its proper divisors (155744101274).

210205656166 is a wasteful number, since it uses less digits than its factorization.

210205656166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661.

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 210205656166 in words is "two hundred ten billion, two hundred five million, six hundred fifty-six thousand, one hundred sixty-six".