166507609 has 8 divisors (see below), whose sum is σ = 170051400. Its totient is φ = 162978816.

The previous prime is 166507577. The next prime is 166507619. The reversal of 166507609 is 906705661.

It can be written as a sum of positive squares in 4 ways, for example, as 34257609 + 132250000 = 5853^2 + 11500^2 .

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

It is not a de Polignac number, because 166507609 - 2⁵ = 166507577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166507619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20299 + ... + 27295.

It is an arithmetic number, because the mean of its divisors is an integer number (21256425).

Almost surely, 2^166507609 is an apocalyptic number.

It is an amenable number.

166507609 is a deficient number, since it is larger than the sum of its proper divisors (3543791).

166507609 is an equidigital number, since it uses as much as digits as its factorization.

166507609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7499.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 166507609 is about 12903.7827399565. The cubic root of 166507609 is about 550.1460868139.

The spelling of 166507609 in words is "one hundred sixty-six million, five hundred seven thousand, six hundred nine".