166778841 has 8 divisors (see below), whose sum is σ = 222479584. Its totient is φ = 111132000.

The previous prime is 166778809. The next prime is 166778881. The reversal of 166778841 is 148877661.

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

It is not a de Polignac number, because 166778841 - 2⁵ = 166778809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166778881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5596 + ... + 19101.

It is an arithmetic number, because the mean of its divisors is an integer number (27809948).

Almost surely, 2^166778841 is an apocalyptic number.

It is an amenable number.

166778841 is a deficient number, since it is larger than the sum of its proper divisors (55700743).

166778841 is a wasteful number, since it uses less digits than its factorization.

166778841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26951.

The product of its digits is 451584, while the sum is 48.

The square root of 166778841 is about 12914.2882498417. The cubic root of 166778841 is about 550.4446442898. Note that the first 3 decimals are identical.

It can be divided in two parts, 1667 and 78841, that added together give a palindrome (80508).

The spelling of 166778841 in words is "one hundred sixty-six million, seven hundred seventy-eight thousand, eight hundred forty-one".