166036609 has 4 divisors (see below), whose sum is σ = 173255616. Its totient is φ = 158817604.

The previous prime is 166036601. The next prime is 166036613. The reversal of 166036609 is 906630661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 906630661 = 1279 ⋅708859.

It is a cyclic number.

It is not a de Polignac number, because 166036609 - 2³ = 166036601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166036601) 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, 3609469 + ... + 3609514.

It is an arithmetic number, because the mean of its divisors is an integer number (43313904).

Almost surely, 2^166036609 is an apocalyptic number.

It is an amenable number.

166036609 is a deficient number, since it is larger than the sum of its proper divisors (7219007).

166036609 is an equidigital number, since it uses as much as digits as its factorization.

166036609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7219006.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 166036609 is about 12885.5193531344. The cubic root of 166036609 is about 549.6268642667.

The spelling of 166036609 in words is "one hundred sixty-six million, thirty-six thousand, six hundred nine".