2168663988 has 12 divisors (see below), whose sum is σ = 5060216000. Its totient is φ = 722887992.

The previous prime is 2168663977. The next prime is 2168664019. The reversal of 2168663988 is 8893668612.

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

It is a congruent 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, 90360988 + ... + 90361011.

Almost surely, 2^2168663988 is an apocalyptic number.

It is an amenable number.

2168663988 is an abundant number, since it is smaller than the sum of its proper divisors (2891552012).

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

2168663988 is a wasteful number, since it uses less digits than its factorization.

2168663988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180722006 (or 180722004 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 57.

The square root of 2168663988 is about 46568.9165431192. The cubic root of 2168663988 is about 1294.3868413037.

The spelling of 2168663988 in words is "two billion, one hundred sixty-eight million, six hundred sixty-three thousand, nine hundred eighty-eight".