1211211666686 has 16 divisors (see below), whose sum is σ = 2076650974080. Its totient is φ = 519018685080.

The previous prime is 1211211666659. The next prime is 1211211666719. The reversal of 1211211666686 is 6866661121121.

It is a self number, because there is not a number n which added to its sum of digits gives 1211211666686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5897876 + ... + 6099783.

It is an arithmetic number, because the mean of its divisors is an integer number (129790685880).

Almost surely, 2^{1211211666686} is an apocalyptic number.

1211211666686 is a deficient number, since it is larger than the sum of its proper divisors (865439307394).

1211211666686 is a wasteful number, since it uses less digits than its factorization.

1211211666686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12004879.

The product of its digits is 248832, while the sum is 47.

The spelling of 1211211666686 in words is "one trillion, two hundred eleven billion, two hundred eleven million, six hundred sixty-six thousand, six hundred eighty-six".