998916865 has 16 divisors (see below), whose sum is σ = 1215948240. Its totient is φ = 787691520.

The previous prime is 998916859. The next prime is 998916871. The reversal of 998916865 is 568619899.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (998916859) and next prime (998916871).

It can be written as a sum of positive squares in 8 ways, for example, as 7485696 + 991431169 = 2736^2 + 31487^2 .

It is not a de Polignac number, because 998916865 - 2⁹ = 998916353 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146635 + ... + 153295.

It is an arithmetic number, because the mean of its divisors is an integer number (75996765).

Almost surely, 2^998916865 is an apocalyptic number.

It is an amenable number.

998916865 is a deficient number, since it is larger than the sum of its proper divisors (217031375).

998916865 is a wasteful number, since it uses less digits than its factorization.

998916865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7092.

The product of its digits is 8398080, while the sum is 61.

The square root of 998916865 is about 31605.6460936966. The cubic root of 998916865 is about 999.6388245680.

The spelling of 998916865 in words is "nine hundred ninety-eight million, nine hundred sixteen thousand, eight hundred sixty-five".