166249109 has 8 divisors (see below), whose sum is σ = 179182080. Its totient is φ = 153336816.

The previous prime is 166249091. The next prime is 166249123. The reversal of 166249109 is 901942661.

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

It is a cyclic number.

It is not a de Polignac number, because 166249109 - 2¹⁶ = 166183573 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 (166249159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14264 + ... + 23150.

It is an arithmetic number, because the mean of its divisors is an integer number (22397760).

Almost surely, 2^166249109 is an apocalyptic number.

It is an amenable number.

166249109 is a deficient number, since it is larger than the sum of its proper divisors (12932971).

166249109 is a wasteful number, since it uses less digits than its factorization.

166249109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10339.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 166249109 is about 12893.7624066833. The cubic root of 166249109 is about 549.8612421311.

The spelling of 166249109 in words is "one hundred sixty-six million, two hundred forty-nine thousand, one hundred nine".