998741665 has 4 divisors (see below), whose sum is σ = 1198490004. Its totient is φ = 798993328.

The previous prime is 998741651. The next prime is 998741717. The reversal of 998741665 is 566147899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566147899 = 5867 ⋅96497.

It can be written as a sum of positive squares in 2 ways, for example, as 630562321 + 368179344 = 25111^2 + 19188^2 .

It is a cyclic number.

It is not a de Polignac number, because 998741665 - 2⁷ = 998741537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99874162 + ... + 99874171.

It is an arithmetic number, because the mean of its divisors is an integer number (299622501).

Almost surely, 2^998741665 is an apocalyptic number.

It is an amenable number.

998741665 is a deficient number, since it is larger than the sum of its proper divisors (199748339).

998741665 is a wasteful number, since it uses less digits than its factorization.

998741665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199748338.

The product of its digits is 3265920, while the sum is 55.

The square root of 998741665 is about 31602.8743154796. The cubic root of 998741665 is about 999.5803789428.

The spelling of 998741665 in words is "nine hundred ninety-eight million, seven hundred forty-one thousand, six hundred sixty-five".