999800566 has 8 divisors (see below), whose sum is σ = 1587918600. Its totient is φ = 470494368.

The previous prime is 999800513. The next prime is 999800567. The reversal of 999800566 is 665008999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999800567) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14702916 + ... + 14702983.

It is an arithmetic number, because the mean of its divisors is an integer number (198489825).

Almost surely, 2^999800566 is an apocalyptic number.

999800566 is a deficient number, since it is larger than the sum of its proper divisors (588118034).

999800566 is a wasteful number, since it uses less digits than its factorization.

999800566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29405918.

The product of its (nonzero) digits is 1049760, while the sum is 52.

The square root of 999800566 is about 31619.6231160335. The cubic root of 999800566 is about 999.9335175802.

The spelling of 999800566 in words is "nine hundred ninety-nine million, eight hundred thousand, five hundred sixty-six".