166304409 has 4 divisors (see below), whose sum is σ = 221739216. Its totient is φ = 110869604.

The previous prime is 166304399. The next prime is 166304419. The reversal of 166304409 is 904403661.

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.

It is an interprime number because it is at equal distance from previous prime (166304399) and next prime (166304419).

It is a cyclic number.

It is not a de Polignac number, because 166304409 - 2⁴ = 166304393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166304409.

It is not an unprimeable number, because it can be changed into a prime (166304419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27717399 + ... + 27717404.

It is an arithmetic number, because the mean of its divisors is an integer number (55434804).

Almost surely, 2^166304409 is an apocalyptic number.

It is an amenable number.

166304409 is a deficient number, since it is larger than the sum of its proper divisors (55434807).

166304409 is an equidigital number, since it uses as much as digits as its factorization.

166304409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55434806.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 166304409 is about 12895.9066761512. The cubic root of 166304409 is about 549.9222027702.

The spelling of 166304409 in words is "one hundred sixty-six million, three hundred four thousand, four hundred nine".