166405426 has 8 divisors (see below), whose sum is σ = 272299824. Its totient is φ = 75638820.

The previous prime is 166405417. The next prime is 166405453. The reversal of 166405426 is 624504661.

166405426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 166405391 and 166405400.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3781920 + ... + 3781963.

It is an arithmetic number, because the mean of its divisors is an integer number (34037478).

Almost surely, 2^166405426 is an apocalyptic number.

166405426 is a deficient number, since it is larger than the sum of its proper divisors (105894398).

166405426 is a wasteful number, since it uses less digits than its factorization.

166405426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7563896.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 166405426 is about 12899.8227119600. The cubic root of 166405426 is about 550.0335252292.

The spelling of 166405426 in words is "one hundred sixty-six million, four hundred five thousand, four hundred twenty-six".