166989968 has 10 divisors (see below), whose sum is σ = 323543094. Its totient is φ = 83494976.

The previous prime is 166989961. The next prime is 166989971. The reversal of 166989968 is 869989661.

It can be written as a sum of positive squares in only one way, i.e., 162613504 + 4376464 = 12752^2 + 2092^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 166989968.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5218421 + ... + 5218452.

Almost surely, 2^166989968 is an apocalyptic number.

It is an amenable number.

166989968 is a deficient number, since it is larger than the sum of its proper divisors (156553126).

166989968 is a wasteful number, since it uses less digits than its factorization.

166989968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10436881 (or 10436875 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 62.

The square root of 166989968 is about 12922.4598277573. The cubic root of 166989968 is about 550.6768174709.

The spelling of 166989968 in words is "one hundred sixty-six million, nine hundred eighty-nine thousand, nine hundred sixty-eight".