166220606 has 4 divisors (see below), whose sum is σ = 249330912. Its totient is φ = 83110302.

The previous prime is 166220599. The next prime is 166220617. The reversal of 166220606 is 606022661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 606022661 = 347 ⋅1746463.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41555150 + ... + 41555153.

It is an arithmetic number, because the mean of its divisors is an integer number (62332728).

Almost surely, 2^166220606 is an apocalyptic number.

166220606 is a deficient number, since it is larger than the sum of its proper divisors (83110306).

166220606 is an equidigital number, since it uses as much as digits as its factorization.

166220606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83110305.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 166220606 is about 12892.6570574106. The cubic root of 166220606 is about 549.8298162168.

The spelling of 166220606 in words is "one hundred sixty-six million, two hundred twenty thousand, six hundred six".