646306133 has 6 divisors (see below), whose sum is σ = 710402742. Its totient is φ = 587550920.

The previous prime is 646306127. The next prime is 646306169. The reversal of 646306133 is 331603646.

646306133 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 456335044 + 189971089 = 21362^2 + 13783^2 .

It is not a de Polignac number, because 646306133 - 2⁴ = 646306117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 646306133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646306103) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2670566 + ... + 2670807.

It is an arithmetic number, because the mean of its divisors is an integer number (118400457).

Almost surely, 2^646306133 is an apocalyptic number.

It is an amenable number.

646306133 is a deficient number, since it is larger than the sum of its proper divisors (64096609).

646306133 is a wasteful number, since it uses less digits than its factorization.

646306133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5341395 (or 5341384 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 32.

The square root of 646306133 is about 25422.5516618612. The cubic root of 646306133 is about 864.5950783905.

Adding to 646306133 its reverse (331603646), we get a palindrome (977909779).

The spelling of 646306133 in words is "six hundred forty-six million, three hundred six thousand, one hundred thirty-three".