1604663173 has 4 divisors (see below), whose sum is σ = 1604917548. Its totient is φ = 1604408800.

The previous prime is 1604663171. The next prime is 1604663189. The reversal of 1604663173 is 3713664061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3713664061 = 181 ⋅20517481.

It can be written as a sum of positive squares in 2 ways, for example, as 340291809 + 1264371364 = 18447^2 + 35558^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604663173 - 2¹ = 1604663171 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 (1604663171) 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, 117478 + ... + 130423.

It is an arithmetic number, because the mean of its divisors is an integer number (401229387).

Almost surely, 2^1604663173 is an apocalyptic number.

It is an amenable number.

1604663173 is a deficient number, since it is larger than the sum of its proper divisors (254375).

1604663173 is an equidigital number, since it uses as much as digits as its factorization.

1604663173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254374.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 1604663173 is about 40058.2472532187. The cubic root of 1604663173 is about 1170.7422599063.

The spelling of 1604663173 in words is "one billion, six hundred four million, six hundred sixty-three thousand, one hundred seventy-three".