646133173 has 4 divisors (see below), whose sum is σ = 738437920. Its totient is φ = 553828428.

The previous prime is 646133119. The next prime is 646133203. The reversal of 646133173 is 371331646.

646133173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 646133173 - 2²¹ = 644036021 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 (646133573) 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, 46152363 + ... + 46152376.

It is an arithmetic number, because the mean of its divisors is an integer number (184609480).

Almost surely, 2^646133173 is an apocalyptic number.

It is an amenable number.

646133173 is a deficient number, since it is larger than the sum of its proper divisors (92304747).

646133173 is an equidigital number, since it uses as much as digits as its factorization.

646133173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92304746.

The product of its digits is 27216, while the sum is 34.

The square root of 646133173 is about 25419.1497300756. The cubic root of 646133173 is about 864.5179458477.

The spelling of 646133173 in words is "six hundred forty-six million, one hundred thirty-three thousand, one hundred seventy-three".