1066220221161 has 8 divisors (see below), whose sum is σ = 1421759507680. Its totient is φ = 710747207712.

The previous prime is 1066220221141. The next prime is 1066220221219. The reversal of 1066220221161 is 1611220226601.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1066220221161 - 2⁶ = 1066220221097 is a prime.

It is a super-2 number, since 2×1066220221161² (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 (1066220221141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16530715 + ... + 16595088.

It is an arithmetic number, because the mean of its divisors is an integer number (177719938460).

Almost surely, 2^{1066220221161} is an apocalyptic number.

It is an amenable number.

1066220221161 is a deficient number, since it is larger than the sum of its proper divisors (355539286519).

1066220221161 is a wasteful number, since it uses less digits than its factorization.

1066220221161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33136535.

The product of its (nonzero) digits is 3456, while the sum is 30.

Adding to 1066220221161 its reverse (1611220226601), we get a palindrome (2677440447762).

The spelling of 1066220221161 in words is "one trillion, sixty-six billion, two hundred twenty million, two hundred twenty-one thousand, one hundred sixty-one".