998831566 has 16 divisors (see below), whose sum is σ = 1587182256. Its totient is φ = 469800576.

The previous prime is 998831551. The next prime is 998831597. The reversal of 998831566 is 665138899.

It is a happy number.

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, 73540 + ... + 86056.

It is an arithmetic number, because the mean of its divisors is an integer number (99198891).

Almost surely, 2^998831566 is an apocalyptic number.

998831566 is a deficient number, since it is larger than the sum of its proper divisors (588350690).

998831566 is a wasteful number, since it uses less digits than its factorization.

998831566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14883.

The product of its digits is 2799360, while the sum is 55.

The square root of 998831566 is about 31604.2966382737. The cubic root of 998831566 is about 999.6103702083.

The spelling of 998831566 in words is "nine hundred ninety-eight million, eight hundred thirty-one thousand, five hundred sixty-six".