84164809879 has 2 divisors, whose sum is σ = 84164809880. Its totient is φ = 84164809878.

The previous prime is 84164809829. The next prime is 84164809913. The reversal of 84164809879 is 97890846148.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84164809879 - 2¹⁵ = 84164777111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84164809879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84164809829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42082404939 + 42082404940.

It is an arithmetic number, because the mean of its divisors is an integer number (42082404940).

Almost surely, 2^84164809879 is an apocalyptic number.

84164809879 is a deficient number, since it is larger than the sum of its proper divisors (1).

84164809879 is an equidigital number, since it uses as much as digits as its factorization.

84164809879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27869184, while the sum is 64.

The spelling of 84164809879 in words is "eighty-four billion, one hundred sixty-four million, eight hundred nine thousand, eight hundred seventy-nine".