166904545 has 4 divisors (see below), whose sum is σ = 200285460. Its totient is φ = 133523632.

The previous prime is 166904539. The next prime is 166904557. The reversal of 166904545 is 545409661.

It is a happy number.

166904545 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, and also an emirpimes, since its reverse is a distinct semiprime: 545409661 = 173 ⋅3152657.

It can be written as a sum of positive squares in 2 ways, for example, as 113891584 + 53012961 = 10672^2 + 7281^2 .

It is a cyclic number.

It is not a de Polignac number, because 166904545 - 2⁵ = 166904513 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 a junction number, because it is equal to n+sod(n) for n = 166904498 and 166904507.

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, 16690450 + ... + 16690459.

It is an arithmetic number, because the mean of its divisors is an integer number (50071365).

Almost surely, 2^166904545 is an apocalyptic number.

It is an amenable number.

166904545 is a deficient number, since it is larger than the sum of its proper divisors (33380915).

166904545 is an equidigital number, since it uses as much as digits as its factorization.

166904545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33380914.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 166904545 is about 12919.1541905807. The cubic root of 166904545 is about 550.5829026692.

The spelling of 166904545 in words is "one hundred sixty-six million, nine hundred four thousand, five hundred forty-five".