665617116228 has 12 divisors (see below), whose sum is σ = 1553106604560. Its totient is φ = 221872372072.

The previous prime is 665617116223. The next prime is 665617116343. The reversal of 665617116228 is 822611716566.

It is a happy number.

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

It is a super-2 number, since 2×665617116228² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665617116223) 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, 27734046498 + ... + 27734046521.

It is an arithmetic number, because the mean of its divisors is an integer number (129425550380).

Almost surely, 2^665617116228 is an apocalyptic number.

It is an amenable number.

665617116228 is an abundant number, since it is smaller than the sum of its proper divisors (887489488332).

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

665617116228 is a wasteful number, since it uses less digits than its factorization.

665617116228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55468093026 (or 55468093024 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The spelling of 665617116228 in words is "six hundred sixty-five billion, six hundred seventeen million, one hundred sixteen thousand, two hundred twenty-eight".