1166506221 has 16 divisors (see below), whose sum is σ = 1652928768. Its totient is φ = 729216000.

The previous prime is 1166506219. The next prime is 1166506259. The reversal of 1166506221 is 1226056611.

It is not a de Polignac number, because 1166506221 - 2¹ = 1166506219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1166506261) 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, 28380 + ... + 56021.

It is an arithmetic number, because the mean of its divisors is an integer number (103308048).

Almost surely, 2^1166506221 is an apocalyptic number.

It is an amenable number.

1166506221 is a deficient number, since it is larger than the sum of its proper divisors (486422547).

1166506221 is a wasteful number, since it uses less digits than its factorization.

1166506221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84692.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 1166506221 is about 34154.1537883754. The cubic root of 1166506221 is about 1052.6783387052.

The spelling of 1166506221 in words is "one billion, one hundred sixty-six million, five hundred six thousand, two hundred twenty-one".