645606443215 has 32 divisors (see below), whose sum is σ = 836895810240. Its totient is φ = 476508902400.

The previous prime is 645606443191. The next prime is 645606443219. The reversal of 645606443215 is 512344606546.

It is a de Polignac number, because none of the positive numbers 2^k-645606443215 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645606443219) 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 31 ways as a sum of consecutive naturals, for example, 2020725 + ... + 2318305.

It is an arithmetic number, because the mean of its divisors is an integer number (26152994070).

Almost surely, 2^645606443215 is an apocalyptic number.

645606443215 is a deficient number, since it is larger than the sum of its proper divisors (191289367025).

645606443215 is a wasteful number, since it uses less digits than its factorization.

645606443215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298203.

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 645606443215 in words is "six hundred forty-five billion, six hundred six million, four hundred forty-three thousand, two hundred fifteen".