166222066 has 4 divisors (see below), whose sum is σ = 249333102. Its totient is φ = 83111032.

The previous prime is 166222037. The next prime is 166222079. The reversal of 166222066 is 660222661.

166222066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 660222661 = 7 ⋅94317523.

It can be written as a sum of positive squares in only one way, i.e., 98505625 + 67716441 = 9925^2 + 8229^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41555515 + ... + 41555518.

Almost surely, 2^166222066 is an apocalyptic number.

166222066 is a deficient number, since it is larger than the sum of its proper divisors (83111036).

166222066 is an equidigital number, since it uses as much as digits as its factorization.

166222066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83111035.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 166222066 is about 12892.7136786636. The cubic root of 166222066 is about 549.8314260236.

The spelling of 166222066 in words is "one hundred sixty-six million, two hundred twenty-two thousand, sixty-six".