665556016 has 20 divisors (see below), whose sum is σ = 1357384600. Its totient is φ = 315263232.

The previous prime is 665556013. The next prime is 665556041. The reversal of 665556016 is 610655566.

It is a self number, because there is not a number n which added to its sum of digits gives 665556016.

It is not an unprimeable number, because it can be changed into a prime (665556013) 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, 1094361 + ... + 1094968.

It is an arithmetic number, because the mean of its divisors is an integer number (67869230).

Almost surely, 2^665556016 is an apocalyptic number.

It is an amenable number.

665556016 is an abundant number, since it is smaller than the sum of its proper divisors (691828584).

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

665556016 is a wasteful number, since it uses less digits than its factorization.

665556016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189356 (or 2189350 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 665556016 is about 25798.3723517589. The cubic root of 665556016 is about 873.0950737237.

The spelling of 665556016 in words is "six hundred sixty-five million, five hundred fifty-six thousand, sixteen".