6668645016 has 32 divisors (see below), whose sum is σ = 18187214400. Its totient is φ = 2020801440.

The previous prime is 6668645003. The next prime is 6668645051. The reversal of 6668645016 is 6105468666.

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, 12629746 + ... + 12630273.

It is an arithmetic number, because the mean of its divisors is an integer number (568350450).

Almost surely, 2^6668645016 is an apocalyptic number.

6668645016 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

6668645016 is an abundant number, since it is smaller than the sum of its proper divisors (11518569384).

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

6668645016 is a wasteful number, since it uses less digits than its factorization.

6668645016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25260039 (or 25260035 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 6668645016 is about 81661.7720601262. The cubic root of 6668645016 is about 1882.2582091497.

The spelling of 6668645016 in words is "six billion, six hundred sixty-eight million, six hundred forty-five thousand, sixteen".