221740705568 has 18 divisors (see below), whose sum is σ = 436557258459. Its totient is φ = 110869020896.

The previous prime is 221740705547. The next prime is 221740705609. The reversal of 221740705568 is 865507047122.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 110870352784 + 110870352784 = 332972^2 + 332972^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=332972.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2622155 + ... + 2705397.

Almost surely, 2^221740705568 is an apocalyptic number.

It is an amenable number.

221740705568 is a deficient number, since it is larger than the sum of its proper divisors (214816552891).

221740705568 is an frugal number, since it uses more digits than its factorization.

221740705568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166496 (or 83245 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 47.

The spelling of 221740705568 in words is "two hundred twenty-one billion, seven hundred forty million, seven hundred five thousand, five hundred sixty-eight".