998795665 has 24 divisors (see below), whose sum is σ = 1439223552. Its totient is φ = 662790240.

The previous prime is 998795663. The next prime is 998795669. The reversal of 998795665 is 566597899.

It is a happy number.

It is not a de Polignac number, because 998795665 - 2¹ = 998795663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 998795597 and 998795606.

It is not an unprimeable number, because it can be changed into a prime (998795663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58159 + ... + 73348.

It is an arithmetic number, because the mean of its divisors is an integer number (59967648).

Almost surely, 2^998795665 is an apocalyptic number.

It is an amenable number.

998795665 is a deficient number, since it is larger than the sum of its proper divisors (440427887).

998795665 is a wasteful number, since it uses less digits than its factorization.

998795665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131557 (or 131550 counting only the distinct ones).

The product of its digits is 36741600, while the sum is 64.

The square root of 998795665 is about 31603.7286566000. The cubic root of 998795665 is about 999.5983937340.

The spelling of 998795665 in words is "nine hundred ninety-eight million, seven hundred ninety-five thousand, six hundred sixty-five".