1998676669 has 12 divisors (see below), whose sum is σ = 2197974492. Its totient is φ = 1816084160.

The previous prime is 1998676663. The next prime is 1998676727. The reversal of 1998676669 is 9666768991.

It can be written as a sum of positive squares in 2 ways, for example, as 1701562500 + 297114169 = 41250^2 + 17237^2 .

It is not a de Polignac number, because 1998676669 - 2⁵ = 1998676637 is a prime.

It is a super-2 number, since 2×1998676669² = 7989416854409871122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998676663) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 471849 + ... + 476065.

It is an arithmetic number, because the mean of its divisors is an integer number (183164541).

Almost surely, 2^1998676669 is an apocalyptic number.

It is an amenable number.

1998676669 is a deficient number, since it is larger than the sum of its proper divisors (199297823).

1998676669 is a wasteful number, since it uses less digits than its factorization.

1998676669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8156 (or 8145 counting only the distinct ones).

The product of its digits is 52907904, while the sum is 67.

The square root of 1998676669 is about 44706.5618114388. The cubic root of 1998676669 is about 1259.6431064869.

The spelling of 1998676669 in words is "one billion, nine hundred ninety-eight million, six hundred seventy-six thousand, six hundred sixty-nine".