1066011338221 has 4 divisors (see below), whose sum is σ = 1066251381244. Its totient is φ = 1065771295200.

The previous prime is 1066011338177. The next prime is 1066011338237. The reversal of 1066011338221 is 1228331106601.

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 811465862596 + 254545475625 = 900814^2 + 504525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066011338221 - 2³⁷ = 928572384749 is a prime.

It is a super-2 number, since 2×1066011338221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066011338261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120014850 + ... + 120023731.

It is an arithmetic number, because the mean of its divisors is an integer number (266562845311).

Almost surely, 2^{1066011338221} is an apocalyptic number.

It is an amenable number.

1066011338221 is a deficient number, since it is larger than the sum of its proper divisors (240043023).

1066011338221 is an equidigital number, since it uses as much as digits as its factorization.

1066011338221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240043022.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 1066011338221 in words is "one trillion, sixty-six billion, eleven million, three hundred thirty-eight thousand, two hundred twenty-one".