166378141 has 4 divisors (see below), whose sum is σ = 166407484. Its totient is φ = 166348800.

The previous prime is 166378103. The next prime is 166378153. The reversal of 166378141 is 141873661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 84548025 + 81830116 = 9195^2 + 9046^2 .

It is a cyclic number.

It is not a de Polignac number, because 166378141 - 2²⁵ = 132823709 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 166378141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166378241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3150 + ... + 18511.

It is an arithmetic number, because the mean of its divisors is an integer number (41601871).

Almost surely, 2^166378141 is an apocalyptic number.

It is an amenable number.

166378141 is a deficient number, since it is larger than the sum of its proper divisors (29343).

166378141 is an equidigital number, since it uses as much as digits as its factorization.

166378141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29342.

The product of its digits is 24192, while the sum is 37.

The square root of 166378141 is about 12898.7650959307. The cubic root of 166378141 is about 550.0034611352.

The spelling of 166378141 in words is "one hundred sixty-six million, three hundred seventy-eight thousand, one hundred forty-one".