645141302216 has 8 divisors (see below), whose sum is σ = 1209639941670. Its totient is φ = 322570651104.

The previous prime is 645141302161. The next prime is 645141302227. The reversal of 645141302216 is 612203141546.

It can be written as a sum of positive squares in only one way, i.e., 445462804900 + 199678497316 = 667430^2 + 446854^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40321331381 + ... + 40321331396.

Almost surely, 2^645141302216 is an apocalyptic number.

It is an amenable number.

645141302216 is a deficient number, since it is larger than the sum of its proper divisors (564498639454).

645141302216 is a wasteful number, since it uses less digits than its factorization.

645141302216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80642662783 (or 80642662779 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 645141302216 in words is "six hundred forty-five billion, one hundred forty-one million, three hundred two thousand, two hundred sixteen".