643485015 has 12 divisors (see below), whose sum is σ = 1115374104. Its totient is φ = 343191984.

The previous prime is 643485013. The next prime is 643485047. The reversal of 643485015 is 510584346.

It is a happy number.

643485015 is a `hidden beast` number, since 643 + 4 + 8 + 5 + 0 + 1 + 5 = 666.

It is not a de Polignac number, because 643485015 - 2¹ = 643485013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643485013) 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 11 ways as a sum of consecutive naturals, for example, 7149789 + ... + 7149878.

It is an arithmetic number, because the mean of its divisors is an integer number (92947842).

Almost surely, 2^643485015 is an apocalyptic number.

643485015 is a deficient number, since it is larger than the sum of its proper divisors (471889089).

643485015 is a wasteful number, since it uses less digits than its factorization.

643485015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14299678 (or 14299675 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 643485015 is about 25367.0064256703. The cubic root of 643485015 is about 863.3352614292.

The spelling of 643485015 in words is "six hundred forty-three million, four hundred eighty-five thousand, fifteen".