162221666 has 8 divisors (see below), whose sum is σ = 249267564. Its totient is φ = 79132480.

The previous prime is 162221651. The next prime is 162221669. The reversal of 162221666 is 666122261.

162221666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 135233641 + 26988025 = 11629^2 + 5195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (162221669) 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, 989075 + ... + 989238.

Almost surely, 2^162221666 is an apocalyptic number.

162221666 is a deficient number, since it is larger than the sum of its proper divisors (87045898).

162221666 is a wasteful number, since it uses less digits than its factorization.

162221666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978356.

The product of its digits is 10368, while the sum is 32.

The square root of 162221666 is about 12736.6269475085. The cubic root of 162221666 is about 545.3847027122.

The spelling of 162221666 in words is "one hundred sixty-two million, two hundred twenty-one thousand, six hundred sixty-six".