2221036566161 has 16 divisors (see below), whose sum is σ = 2542774926336. Its totient is φ = 1900412868816.

The previous prime is 2221036566149. The next prime is 2221036566179. The reversal of 2221036566161 is 1616656301222.

It is a happy number.

It is not a de Polignac number, because 2221036566161 - 2²⁶ = 2220969457297 is a prime.

It is a super-2 number, since 2×2221036566161² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2221036569161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9476390 + ... + 9707936.

It is an arithmetic number, because the mean of its divisors is an integer number (158923432896).

Almost surely, 2^{2221036566161} is an apocalyptic number.

It is an amenable number.

2221036566161 is a deficient number, since it is larger than the sum of its proper divisors (321738360175).

2221036566161 is a wasteful number, since it uses less digits than its factorization.

2221036566161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233948.

The product of its (nonzero) digits is 155520, while the sum is 41.

The spelling of 2221036566161 in words is "two trillion, two hundred twenty-one billion, thirty-six million, five hundred sixty-six thousand, one hundred sixty-one".