217061212166 has 32 divisors (see below), whose sum is σ = 356687670528. Its totient is φ = 98622904320.

The previous prime is 217061212163. The next prime is 217061212211. The reversal of 217061212166 is 661212160712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217061212163) 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, 218576 + ... + 694188.

It is an arithmetic number, because the mean of its divisors is an integer number (11146489704).

Almost surely, 2^217061212166 is an apocalyptic number.

217061212166 is a deficient number, since it is larger than the sum of its proper divisors (139626458362).

217061212166 is a wasteful number, since it uses less digits than its factorization.

217061212166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476096.

The product of its (nonzero) digits is 12096, while the sum is 35.

Adding to 217061212166 its reverse (661212160712), we get a palindrome (878273372878).

The spelling of 217061212166 in words is "two hundred seventeen billion, sixty-one million, two hundred twelve thousand, one hundred sixty-six".