1866812022866 has 16 divisors (see below), whose sum is σ = 3210539379840. Its totient is φ = 797489746080.

The previous prime is 1866812022853. The next prime is 1866812022931. The reversal of 1866812022866 is 6682202186681.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 214374611 + ... + 214383318.

It is an arithmetic number, because the mean of its divisors is an integer number (200658711240).

Almost surely, 2^{1866812022866} is an apocalyptic number.

1866812022866 is a deficient number, since it is larger than the sum of its proper divisors (1343727356974).

1866812022866 is a wasteful number, since it uses less digits than its factorization.

1866812022866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428758249.

The product of its (nonzero) digits is 5308416, while the sum is 56.

The spelling of 1866812022866 in words is "one trillion, eight hundred sixty-six billion, eight hundred twelve million, twenty-two thousand, eight hundred sixty-six".