16665143866 has 64 divisors (see below), whose sum is σ = 30037985280. Its totient is φ = 6784404480.

The previous prime is 16665143861. The next prime is 16665143867. The reversal of 16665143866 is 66834156661.

It is not an unprimeable number, because it can be changed into a prime (16665143861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7254030 + ... + 7256326.

It is an arithmetic number, because the mean of its divisors is an integer number (469343520).

Almost surely, 2^16665143866 is an apocalyptic number.

16665143866 is a deficient number, since it is larger than the sum of its proper divisors (13372841414).

16665143866 is a wasteful number, since it uses less digits than its factorization.

16665143866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639.

The product of its digits is 3732480, while the sum is 52.

The spelling of 16665143866 in words is "sixteen billion, six hundred sixty-five million, one hundred forty-three thousand, eight hundred sixty-six".