166604473 has 4 divisors (see below), whose sum is σ = 190405120. Its totient is φ = 142803828.

The previous prime is 166604453. The next prime is 166604533. The reversal of 166604473 is 374406661.

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: 374406661 = 8737 ⋅42853.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166604473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166604423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11900313 + ... + 11900326.

It is an arithmetic number, because the mean of its divisors is an integer number (47601280).

Almost surely, 2^166604473 is an apocalyptic number.

It is an amenable number.

166604473 is a deficient number, since it is larger than the sum of its proper divisors (23800647).

166604473 is an equidigital number, since it uses as much as digits as its factorization.

166604473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23800646.

The product of its (nonzero) digits is 72576, while the sum is 37.

The square root of 166604473 is about 12907.5355122502. The cubic root of 166604473 is about 550.2527466451.

The spelling of 166604473 in words is "one hundred sixty-six million, six hundred four thousand, four hundred seventy-three".