166405071 has 8 divisors (see below), whose sum is σ = 253569664. Its totient is φ = 95088600.

The previous prime is 166405003. The next prime is 166405073. The reversal of 166405071 is 170504661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166405071 - 2¹⁷ = 166273999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166405073) 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 7 ways as a sum of consecutive naturals, for example, 3962005 + ... + 3962046.

It is an arithmetic number, because the mean of its divisors is an integer number (31696208).

Almost surely, 2^166405071 is an apocalyptic number.

166405071 is a deficient number, since it is larger than the sum of its proper divisors (87164593).

166405071 is an equidigital number, since it uses as much as digits as its factorization.

166405071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7924061.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 166405071 is about 12899.8089520737. The cubic root of 166405071 is about 550.0331340920.

The spelling of 166405071 in words is "one hundred sixty-six million, four hundred five thousand, seventy-one".