1998676668 has 12 divisors (see below), whose sum is σ = 4663578920. Its totient is φ = 666225552.

The previous prime is 1998676663. The next prime is 1998676727. The reversal of 1998676668 is 8666768991.

1998676668 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1998676599 and 1998676608.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83278183 + ... + 83278206.

Almost surely, 2^1998676668 is an apocalyptic number.

It is an amenable number.

1998676668 is an abundant number, since it is smaller than the sum of its proper divisors (2664902252).

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

1998676668 is a wasteful number, since it uses less digits than its factorization.

1998676668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166556396 (or 166556394 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 66.

The square root of 1998676668 is about 44706.5618002548. The cubic root of 1998676668 is about 1259.6431062768.

The spelling of 1998676668 in words is "one billion, nine hundred ninety-eight million, six hundred seventy-six thousand, six hundred sixty-eight".