166426 has 16 divisors (see below), whose sum is σ = 277704. Its totient is φ = 74304.

The previous prime is 166417. The next prime is 166429. The reversal of 166426 is 624661.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 164025 + 2401 = 405^2 + 49^2 .

It is a super-2 number, since 2×166426² = 55395226952, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166426.

It is not an unprimeable number, because it can be changed into a prime (166429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876 + ... + 1048.

2¹⁶⁶⁴²⁶ is an apocalyptic number.

166426 is a deficient number, since it is larger than the sum of its proper divisors (111278).

166426 is a wasteful number, since it uses less digits than its factorization.

166426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225.

The product of its digits is 1728, while the sum is 25.

The square root of 166426 is about 407.9534287146. The cubic root of 166426 is about 55.0056192606.

It can be divided in two parts, 1664 and 26, that multiplied together give a square (43264 = 208²).

The spelling of 166426 in words is "one hundred sixty-six thousand, four hundred twenty-six".