664838811228 has 24 divisors (see below), whose sum is σ = 1551350389120. Its totient is φ = 221604390000.

The previous prime is 664838811223. The next prime is 664838811253. The reversal of 664838811228 is 822118838466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664838811223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 740248 + ... + 1370271.

Almost surely, 2^664838811228 is an apocalyptic number.

It is an amenable number.

664838811228 is an abundant number, since it is smaller than the sum of its proper divisors (886511577892).

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

664838811228 is a wasteful number, since it uses less digits than its factorization.

664838811228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136777 (or 2136775 counting only the distinct ones).

The product of its digits is 7077888, while the sum is 57.

The spelling of 664838811228 in words is "six hundred sixty-four billion, eight hundred thirty-eight million, eight hundred eleven thousand, two hundred twenty-eight".