223327721665 has 4 divisors (see below), whose sum is σ = 267993266004. Its totient is φ = 178662177328.

The previous prime is 223327721657. The next prime is 223327721693. The reversal of 223327721665 is 566127723322.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60291855936 + 163035865729 = 245544^2 + 403777^2 .

It is a cyclic number.

It is not a de Polignac number, because 223327721665 - 2³ = 223327721657 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 22332772162 + ... + 22332772171.

It is an arithmetic number, because the mean of its divisors is an integer number (66998316501).

Almost surely, 2^223327721665 is an apocalyptic number.

It is an amenable number.

223327721665 is a deficient number, since it is larger than the sum of its proper divisors (44665544339).

223327721665 is an equidigital number, since it uses as much as digits as its factorization.

223327721665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44665544338.

The product of its digits is 1270080, while the sum is 46.

The spelling of 223327721665 in words is "two hundred twenty-three billion, three hundred twenty-seven million, seven hundred twenty-one thousand, six hundred sixty-five".