222016591561 has 4 divisors (see below), whose sum is σ = 222053532624. Its totient is φ = 221979650500.

The previous prime is 222016591553. The next prime is 222016591609. The reversal of 222016591561 is 165195610222.

222016591561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 222016591561 - 2³ = 222016591553 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (222016591501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18461515 + ... + 18473536.

It is an arithmetic number, because the mean of its divisors is an integer number (55513383156).

Almost surely, 2^222016591561 is an apocalyptic number.

It is an amenable number.

222016591561 is a deficient number, since it is larger than the sum of its proper divisors (36941063).

222016591561 is an equidigital number, since it uses as much as digits as its factorization.

222016591561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36941062.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 222016591561 in words is "two hundred twenty-two billion, sixteen million, five hundred ninety-one thousand, five hundred sixty-one".