1066600221 has 16 divisors (see below), whose sum is σ = 1461844800. Its totient is φ = 691750224.

The previous prime is 1066600219. The next prime is 1066600253. The reversal of 1066600221 is 1220066601.

It is not a de Polignac number, because 1066600221 - 2¹ = 1066600219 is a prime.

It is a super-2 number, since 2×1066600221² = 2275272062874497682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1066600191 and 1066600200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066600261) 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 15 ways as a sum of consecutive naturals, for example, 148450 + ... + 155468.

It is an arithmetic number, because the mean of its divisors is an integer number (91365300).

Almost surely, 2^1066600221 is an apocalyptic number.

It is an amenable number.

1066600221 is a deficient number, since it is larger than the sum of its proper divisors (395244579).

1066600221 is an frugal number, since it uses more digits than its factorization.

1066600221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7133 (or 7059 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1066600221 is about 32658.8459838985. The cubic root of 1066600221 is about 1021.7246936087.

Adding to 1066600221 its reverse (1220066601), we get a palindrome (2286666822).

The spelling of 1066600221 in words is "one billion, sixty-six million, six hundred thousand, two hundred twenty-one".