999999994566 has 16 divisors (see below), whose sum is σ = 2000015321904. Its totient is φ = 333330776064.

The previous prime is 999999994517. The next prime is 999999994579. The reversal of 999999994566 is 665499999999.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 999999994566.

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, 319606 + ... + 1449878.

It is an arithmetic number, because the mean of its divisors is an integer number (125000957619).

Almost surely, 2^999999994566 is an apocalyptic number.

999999994566 is an abundant number, since it is smaller than the sum of its proper divisors (1000015327338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

999999994566 is a wasteful number, since it uses less digits than its factorization.

999999994566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277735.

The product of its digits is 30993639120, while the sum is 93.

The spelling of 999999994566 in words is "nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-four thousand, five hundred sixty-six".