166381201 has 4 divisors (see below), whose sum is σ = 190149952. Its totient is φ = 142612452.

The previous prime is 166381199. The next prime is 166381217. The reversal of 166381201 is 102183661.

166381201 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 102183661 = 173 ⋅590657.

It is a cyclic number.

It is not a de Polignac number, because 166381201 - 2¹ = 166381199 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 166381201.

It is not an unprimeable number, because it can be changed into a prime (166381291) 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, 11884365 + ... + 11884378.

It is an arithmetic number, because the mean of its divisors is an integer number (47537488).

Almost surely, 2^166381201 is an apocalyptic number.

It is an amenable number.

166381201 is a deficient number, since it is larger than the sum of its proper divisors (23768751).

166381201 is an equidigital number, since it uses as much as digits as its factorization.

166381201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23768750.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 166381201 is about 12898.8837113915. The cubic root of 166381201 is about 550.0068329730.

The spelling of 166381201 in words is "one hundred sixty-six million, three hundred eighty-one thousand, two hundred one".