998111865 has 8 divisors (see below), whose sum is σ = 1596979008. Its totient is φ = 532326320.

The previous prime is 998111839. The next prime is 998111897. The reversal of 998111865 is 568111899.

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

It is not a de Polignac number, because 998111865 - 2⁹ = 998111353 is a prime.

It is a Curzon 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, 33270381 + ... + 33270410.

It is an arithmetic number, because the mean of its divisors is an integer number (199622376).

Almost surely, 2^998111865 is an apocalyptic number.

It is an amenable number.

998111865 is a deficient number, since it is larger than the sum of its proper divisors (598867143).

998111865 is a wasteful number, since it uses less digits than its factorization.

998111865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66540799.

The product of its digits is 155520, while the sum is 48.

The square root of 998111865 is about 31592.9084606024. The cubic root of 998111865 is about 999.3702251335.

The spelling of 998111865 in words is "nine hundred ninety-eight million, one hundred eleven thousand, eight hundred sixty-five".