166778133 has 8 divisors (see below), whose sum is σ = 222440448. Its totient is φ = 111150624.

The previous prime is 166778113. The next prime is 166778147. The reversal of 166778133 is 331877661.

166778133 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 not a de Polignac number, because 166778133 - 2⁶ = 166778069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166778113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6060 + ... + 19242.

It is an arithmetic number, because the mean of its divisors is an integer number (27805056).

Almost surely, 2^166778133 is an apocalyptic number.

It is an amenable number.

166778133 is a deficient number, since it is larger than the sum of its proper divisors (55662315).

166778133 is a wasteful number, since it uses less digits than its factorization.

166778133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17403.

The product of its digits is 127008, while the sum is 42.

The square root of 166778133 is about 12914.2608383136. The cubic root of 166778133 is about 550.4438653833.

It can be divided in two parts, 1667 and 78133, that added together give a triangular number (79800 = T₃₉₉).

The spelling of 166778133 in words is "one hundred sixty-six million, seven hundred seventy-eight thousand, one hundred thirty-three".