2168686680 has 32 divisors (see below), whose sum is σ = 6506060400. Its totient is φ = 578316416.

The previous prime is 2168686679. The next prime is 2168686769. The reversal of 2168686680 is 866868612.

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, 9036075 + ... + 9036314.

Almost surely, 2^2168686680 is an apocalyptic number.

2168686680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2168686680 is an abundant number, since it is smaller than the sum of its proper divisors (4337373720).

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

2168686680 is a wasteful number, since it uses less digits than its factorization.

2168686680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18072403 (or 18072399 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 51.

The square root of 2168686680 is about 46569.1601813904. The cubic root of 2168686680 is about 1294.3913559302.

The spelling of 2168686680 in words is "two billion, one hundred sixty-eight million, six hundred eighty-six thousand, six hundred eighty".