166404506 has 4 divisors (see below), whose sum is σ = 249606762. Its totient is φ = 83202252.

The previous prime is 166404499. The next prime is 166404529. The reversal of 166404506 is 605404661.

166404506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 165353881 + 1050625 = 12859^2 + 1025^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41601125 + ... + 41601128.

Almost surely, 2^166404506 is an apocalyptic number.

166404506 is a deficient number, since it is larger than the sum of its proper divisors (83202256).

166404506 is an equidigital number, since it uses as much as digits as its factorization.

166404506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83202255.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 166404506 is about 12899.7870525059. The cubic root of 166404506 is about 550.0325115768.

The spelling of 166404506 in words is "one hundred sixty-six million, four hundred four thousand, five hundred six".