8643512879 has 2 divisors, whose sum is σ = 8643512880. Its totient is φ = 8643512878.

The previous prime is 8643512849. The next prime is 8643512887. The reversal of 8643512879 is 9782153468.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8643512879 is a prime.

It is a super-4 number, since 4×8643512879⁴ (a number of 41 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8643512879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8643512809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321756439 + 4321756440.

It is an arithmetic number, because the mean of its divisors is an integer number (4321756440).

Almost surely, 2^8643512879 is an apocalyptic number.

8643512879 is a deficient number, since it is larger than the sum of its proper divisors (1).

8643512879 is an equidigital number, since it uses as much as digits as its factorization.

8643512879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The square root of 8643512879 is about 92970.4946690078. The cubic root of 8643512879 is about 2052.2491973394.

The spelling of 8643512879 in words is "eight billion, six hundred forty-three million, five hundred twelve thousand, eight hundred seventy-nine".