643163263279 has 4 divisors (see below), whose sum is σ = 643244612184. Its totient is φ = 643081914376.

The previous prime is 643163263199. The next prime is 643163263307. The reversal of 643163263279 is 972362361346.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 643163263279 - 2⁹ = 643163262767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643163663279) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40662592 + ... + 40678405.

It is an arithmetic number, because the mean of its divisors is an integer number (160811153046).

Almost surely, 2^643163263279 is an apocalyptic number.

643163263279 is a deficient number, since it is larger than the sum of its proper divisors (81348905).

643163263279 is an equidigital number, since it uses as much as digits as its factorization.

643163263279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81348904.

The product of its digits is 5878656, while the sum is 52.

The spelling of 643163263279 in words is "six hundred forty-three billion, one hundred sixty-three million, two hundred sixty-three thousand, two hundred seventy-nine".