643532651563 has 8 divisors (see below), whose sum is σ = 649975259648. Its totient is φ = 637093788264.

The previous prime is 643532651497. The next prime is 643532651609. The reversal of 643532651563 is 365156235346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643532651563 - 2²¹ = 643530554411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643532654563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 590145 + ... + 1278802.

It is an arithmetic number, because the mean of its divisors is an integer number (81246907456).

Almost surely, 2^643532651563 is an apocalyptic number.

643532651563 is a deficient number, since it is larger than the sum of its proper divisors (6442608085).

643532651563 is a wasteful number, since it uses less digits than its factorization.

643532651563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872393.

The product of its digits is 5832000, while the sum is 49.

The spelling of 643532651563 in words is "six hundred forty-three billion, five hundred thirty-two million, six hundred fifty-one thousand, five hundred sixty-three".