1066600121 has 4 divisors (see below), whose sum is σ = 1066669812. Its totient is φ = 1066530432.

The previous prime is 1066600103. The next prime is 1066600141. The reversal of 1066600121 is 1210066601.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1210066601 = 3833 ⋅315697.

It can be written as a sum of positive squares in 2 ways, for example, as 16516096 + 1050084025 = 4064^2 + 32405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066600121 - 2¹⁰ = 1066599097 is a prime.

It is a super-2 number, since 2×1066600121² = 2275271636234429282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066600141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800 + ... + 46193.

It is an arithmetic number, because the mean of its divisors is an integer number (266667453).

Almost surely, 2^1066600121 is an apocalyptic number.

It is an amenable number.

1066600121 is a deficient number, since it is larger than the sum of its proper divisors (69691).

1066600121 is an equidigital number, since it uses as much as digits as its factorization.

1066600121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69690.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1066600121 is about 32658.8444529196. The cubic root of 1066600121 is about 1021.7246616778.

Adding to 1066600121 its reverse (1210066601), we get a palindrome (2276666722).

The spelling of 1066600121 in words is "one billion, sixty-six million, six hundred thousand, one hundred twenty-one".