643641646163 has 8 divisors (see below), whose sum is σ = 649945291008. Its totient is φ = 637339053384.

The previous prime is 643641646103. The next prime is 643641646213. The reversal of 643641646163 is 361646146346.

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 643641646163 - 2¹² = 643641642067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643641646103) 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 7 ways as a sum of consecutive naturals, for example, 995906 + ... + 1509672.

It is an arithmetic number, because the mean of its divisors is an integer number (81243161376).

Almost surely, 2^643641646163 is an apocalyptic number.

643641646163 is a deficient number, since it is larger than the sum of its proper divisors (6303644845).

643641646163 is a wasteful number, since it uses less digits than its factorization.

643641646163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526033.

The product of its digits is 4478976, while the sum is 50.

The spelling of 643641646163 in words is "six hundred forty-three billion, six hundred forty-one million, six hundred forty-six thousand, one hundred sixty-three".