1998665335 has 8 divisors (see below), whose sum is σ = 2456896176. Its totient is φ = 1559933760.

The previous prime is 1998665303. The next prime is 1998665353. The reversal of 1998665335 is 5335668991.

It is a happy number.

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

It is not a de Polignac number, because 1998665335 - 2⁵ = 1998665303 is a prime.

It is a Duffinian 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, 4874589 + ... + 4874998.

It is an arithmetic number, because the mean of its divisors is an integer number (307112022).

Almost surely, 2^1998665335 is an apocalyptic number.

1998665335 is a deficient number, since it is larger than the sum of its proper divisors (458230841).

1998665335 is an equidigital number, since it uses as much as digits as its factorization.

1998665335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9749633.

The product of its digits is 5248800, while the sum is 55.

The square root of 1998665335 is about 44706.4350513436. The cubic root of 1998665335 is about 1259.6407254411.

It can be divided in two parts, 1998665 and 335, that added together give a triangular number (1999000 = T₁₉₉₉).

The spelling of 1998665335 in words is "one billion, nine hundred ninety-eight million, six hundred sixty-five thousand, three hundred thirty-five".