166406395 has 4 divisors (see below), whose sum is σ = 199687680. Its totient is φ = 133125112.

The previous prime is 166406381. The next prime is 166406407. The reversal of 166406395 is 593604661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 593604661 = 13 ⋅45661897.

It is a cyclic number.

It is not a de Polignac number, because 166406395 - 2⁵ = 166406363 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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, 16640635 + ... + 16640644.

It is an arithmetic number, because the mean of its divisors is an integer number (49921920).

Almost surely, 2^166406395 is an apocalyptic number.

166406395 is a deficient number, since it is larger than the sum of its proper divisors (33281285).

166406395 is an equidigital number, since it uses as much as digits as its factorization.

166406395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33281284.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 166406395 is about 12899.8602705611. The cubic root of 166406395 is about 550.0345928655.

The spelling of 166406395 in words is "one hundred sixty-six million, four hundred six thousand, three hundred ninety-five".