166515211 has 4 divisors (see below), whose sum is σ = 166552024. Its totient is φ = 166478400.

The previous prime is 166515197. The next prime is 166515233. The reversal of 166515211 is 112515661.

It is a happy number.

166515211 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: 112515661 = 53 ⋅2122937.

It is a cyclic number.

It is not a de Polignac number, because 166515211 - 2⁵ = 166515179 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166515211.

It is not an unprimeable number, because it can be changed into a prime (166515311) 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, 10485 + ... + 21046.

It is an arithmetic number, because the mean of its divisors is an integer number (41638006).

Almost surely, 2^166515211 is an apocalyptic number.

166515211 is a deficient number, since it is larger than the sum of its proper divisors (36813).

166515211 is an equidigital number, since it uses as much as digits as its factorization.

166515211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36812.

The product of its digits is 1800, while the sum is 28.

The square root of 166515211 is about 12904.0773013804. The cubic root of 166515211 is about 550.1544590978.

The spelling of 166515211 in words is "one hundred sixty-six million, five hundred fifteen thousand, two hundred eleven".