166213506 has 32 divisors (see below), whose sum is σ = 344678400. Its totient is φ = 53378640.

The previous prime is 166213499. The next prime is 166213507. The reversal of 166213506 is 605312661.

166213506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (166213507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42585 + ... + 46323.

It is an arithmetic number, because the mean of its divisors is an integer number (10771200).

Almost surely, 2^166213506 is an apocalyptic number.

166213506 is an abundant number, since it is smaller than the sum of its proper divisors (178464894).

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

166213506 is a wasteful number, since it uses less digits than its factorization.

166213506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4014.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 166213506 is about 12892.3817039366. The cubic root of 166213506 is about 549.8219875700.

The spelling of 166213506 in words is "one hundred sixty-six million, two hundred thirteen thousand, five hundred six".