166989964 has 12 divisors (see below), whose sum is σ = 292816944. Its totient is φ = 83327984.

The previous prime is 166989961. The next prime is 166989971. The reversal of 166989964 is 469989661.

It is a junction number, because it is equal to n+sod(n) for n = 166989899 and 166989908.

It is not an unprimeable number, because it can be changed into a prime (166989961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39487 + ... + 43510.

It is an arithmetic number, because the mean of its divisors is an integer number (24401412).

Almost surely, 2^166989964 is an apocalyptic number.

It is an amenable number.

166989964 is a deficient number, since it is larger than the sum of its proper divisors (125826980).

166989964 is a wasteful number, since it uses less digits than its factorization.

166989964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83504 (or 83502 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 58.

The square root of 166989964 is about 12922.4596729880. The cubic root of 166989964 is about 550.6768130740.

It can be divided in two parts, 16698 and 9964, that added together give a palindrome (26662).

The spelling of 166989964 in words is "one hundred sixty-six million, nine hundred eighty-nine thousand, nine hundred sixty-four".