166778983 has 16 divisors (see below), whose sum is σ = 199203840. Its totient is φ = 136646496.

The previous prime is 166778933. The next prime is 166778999. The reversal of 166778983 is 389877661.

It is not a de Polignac number, because 166778983 - 2¹⁷ = 166647911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166778933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8253 + ... + 20041.

It is an arithmetic number, because the mean of its divisors is an integer number (12450240).

Almost surely, 2^166778983 is an apocalyptic number.

166778983 is a deficient number, since it is larger than the sum of its proper divisors (32424857).

166778983 is a wasteful number, since it uses less digits than its factorization.

166778983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11886.

The product of its digits is 3048192, while the sum is 55.

The square root of 166778983 is about 12914.2937476271. The cubic root of 166778983 is about 550.4448005109. Note that the first 3 decimals are identical.

It can be divided in two parts, 166778 and 983, that added together give a palindrome (167761).

The spelling of 166778983 in words is "one hundred sixty-six million, seven hundred seventy-eight thousand, nine hundred eighty-three".