1998665334 has 32 divisors (see below), whose sum is σ = 4561523040. Its totient is φ = 648215136.

The previous prime is 1998665303. The next prime is 1998665353. The reversal of 1998665334 is 4335668991.

1998665334 is a `hidden beast` number, since 19 + 98 + 6 + 6 + 533 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

1998665334 is a modest number, since divided by 665334 gives 1998 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 498169 + ... + 502164.

It is an arithmetic number, because the mean of its divisors is an integer number (142547595).

Almost surely, 2^1998665334 is an apocalyptic number.

1998665334 is an abundant number, since it is smaller than the sum of its proper divisors (2562857706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1998665334 is a wasteful number, since it uses less digits than its factorization.

1998665334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000381 (or 1000375 counting only the distinct ones).

The product of its digits is 4199040, while the sum is 54.

The square root of 1998665334 is about 44706.4350401595. The cubic root of 1998665334 is about 1259.6407252310.

The spelling of 1998665334 in words is "one billion, nine hundred ninety-eight million, six hundred sixty-five thousand, three hundred thirty-four".