166663449 has 6 divisors (see below), whose sum is σ = 240736106. Its totient is φ = 111108960.

The previous prime is 166663439. The next prime is 166663489. The reversal of 166663449 is 944366661.

It can be written as a sum of positive squares in only one way, i.e., 132089049 + 34574400 = 11493^2 + 5880^2 .

It is not a de Polignac number, because 166663449 - 2¹¹ = 166661401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166663439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9259072 + ... + 9259089.

Almost surely, 2^166663449 is an apocalyptic number.

It is an amenable number.

166663449 is a deficient number, since it is larger than the sum of its proper divisors (74072657).

166663449 is a wasteful number, since it uses less digits than its factorization.

166663449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18518167 (or 18518164 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 166663449 is about 12909.8198670624. The cubic root of 166663449 is about 550.3176666259.

The spelling of 166663449 in words is "one hundred sixty-six million, six hundred sixty-three thousand, four hundred forty-nine".