646441325 has 6 divisors (see below), whose sum is σ = 801587274. Its totient is φ = 517153040.

The previous prime is 646441321. The next prime is 646441331. The reversal of 646441325 is 523144646.

It can be written as a sum of positive squares in 3 ways, for example, as 138344644 + 508096681 = 11762^2 + 22541^2 .

It is not a de Polignac number, because 646441325 - 2² = 646441321 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 (646441321) 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 5 ways as a sum of consecutive naturals, for example, 12928802 + ... + 12928851.

It is an arithmetic number, because the mean of its divisors is an integer number (133597879).

Almost surely, 2^646441325 is an apocalyptic number.

It is an amenable number.

646441325 is a deficient number, since it is larger than the sum of its proper divisors (155145949).

646441325 is a wasteful number, since it uses less digits than its factorization.

646441325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25857663 (or 25857658 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 646441325 is about 25425.2104219414. The cubic root of 646441325 is about 864.6553584874.

The spelling of 646441325 in words is "six hundred forty-six million, four hundred forty-one thousand, three hundred twenty-five".