1661122166 has 32 divisors (see below), whose sum is σ = 2837514240. Its totient is φ = 722462400.

The previous prime is 1661122157. The next prime is 1661122181. The reversal of 1661122166 is 6612211661.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47015 + ... + 74381.

It is an arithmetic number, because the mean of its divisors is an integer number (88672320).

Almost surely, 2^1661122166 is an apocalyptic number.

1661122166 is a deficient number, since it is larger than the sum of its proper divisors (1176392074).

1661122166 is a wasteful number, since it uses less digits than its factorization.

1661122166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27500.

The product of its digits is 5184, while the sum is 32.

The square root of 1661122166 is about 40756.8664889734. The cubic root of 1661122166 is about 1184.3148943871.

The spelling of 1661122166 in words is "one billion, six hundred sixty-one million, one hundred twenty-two thousand, one hundred sixty-six".