84647809879 has 2 divisors, whose sum is σ = 84647809880. Its totient is φ = 84647809878.

The previous prime is 84647809877. The next prime is 84647809901. The reversal of 84647809879 is 97890874648.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84647809879 - 2¹ = 84647809877 is a prime.

It is a super-2 number, since 2×84647809879² (a number of 23 digits) contains 22 as substring.

Together with 84647809877, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84647809877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42323904939 + 42323904940.

It is an arithmetic number, because the mean of its divisors is an integer number (42323904940).

Almost surely, 2^84647809879 is an apocalyptic number.

84647809879 is a deficient number, since it is larger than the sum of its proper divisors (1).

84647809879 is an equidigital number, since it uses as much as digits as its factorization.

84647809879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 195084288, while the sum is 70.

The spelling of 84647809879 in words is "eighty-four billion, six hundred forty-seven million, eight hundred nine thousand, eight hundred seventy-nine".