166427605 has 4 divisors (see below), whose sum is σ = 199713132. Its totient is φ = 133142080.

The previous prime is 166427543. The next prime is 166427627. The reversal of 166427605 is 506724661.

It is a happy number.

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 52664049 + 113763556 = 7257^2 + 10666^2 .

It is not a de Polignac number, because 166427605 - 2¹¹ = 166425557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16642756 + ... + 16642765.

It is an arithmetic number, because the mean of its divisors is an integer number (49928283).

Almost surely, 2^166427605 is an apocalyptic number.

It is an amenable number.

166427605 is a deficient number, since it is larger than the sum of its proper divisors (33285527).

166427605 is an equidigital number, since it uses as much as digits as its factorization.

166427605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33285526.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 166427605 is about 12900.6823462947. The cubic root of 166427605 is about 550.0579608338.

The spelling of 166427605 in words is "one hundred sixty-six million, four hundred twenty-seven thousand, six hundred five".