665681144228 has 6 divisors (see below), whose sum is σ = 1164942002406. Its totient is φ = 332840572112.

The previous prime is 665681144203. The next prime is 665681144267. The reversal of 665681144228 is 822441186566.

665681144228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 461478379684 + 204202764544 = 679322^2 + 451888^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 665681144228.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83210143025 + ... + 83210143032.

It is an arithmetic number, because the mean of its divisors is an integer number (194157000401).

Almost surely, 2^665681144228 is an apocalyptic number.

It is an amenable number.

665681144228 is a deficient number, since it is larger than the sum of its proper divisors (499260858178).

665681144228 is a wasteful number, since it uses less digits than its factorization.

665681144228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166420286061 (or 166420286059 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 53.

The spelling of 665681144228 in words is "six hundred sixty-five billion, six hundred eighty-one million, one hundred forty-four thousand, two hundred twenty-eight".