221664428808 has 16 divisors (see below), whose sum is σ = 554161072080. Its totient is φ = 73888142928.

The previous prime is 221664428807. The next prime is 221664428897. The reversal of 221664428808 is 808824466122.

It is not an unprimeable number, because it can be changed into a prime (221664428801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4618008910 + ... + 4618008957.

It is an arithmetic number, because the mean of its divisors is an integer number (34635067005).

Almost surely, 2^221664428808 is an apocalyptic number.

It is an amenable number.

221664428808 is an abundant number, since it is smaller than the sum of its proper divisors (332496643272).

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

221664428808 is a wasteful number, since it uses less digits than its factorization.

221664428808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9236017876 (or 9236017872 counting only the distinct ones).

The product of its (nonzero) digits is 2359296, while the sum is 51.

The spelling of 221664428808 in words is "two hundred twenty-one billion, six hundred sixty-four million, four hundred twenty-eight thousand, eight hundred eight".