166521606 has 16 divisors (see below), whose sum is σ = 334312704. Its totient is φ = 55295624.

The previous prime is 166521533. The next prime is 166521617. The reversal of 166521606 is 606125661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51186 + ... + 54341.

It is an arithmetic number, because the mean of its divisors is an integer number (20894544).

Almost surely, 2^166521606 is an apocalyptic number.

166521606 is an abundant number, since it is smaller than the sum of its proper divisors (167791098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166521606 is a wasteful number, since it uses less digits than its factorization.

166521606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105795.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 166521606 is about 12904.3250888995. The cubic root of 166521606 is about 550.1615018833.

The spelling of 166521606 in words is "one hundred sixty-six million, five hundred twenty-one thousand, six hundred six".