84969994789 has 2 divisors, whose sum is σ = 84969994790. Its totient is φ = 84969994788.

The previous prime is 84969994787. The next prime is 84969994801. The reversal of 84969994789 is 98749996948.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83238020100 + 1731974689 = 288510^2 + 41617^2 .

It is a cyclic number.

It is not a de Polignac number, because 84969994789 - 2¹ = 84969994787 is a prime.

Together with 84969994787, 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 (84969994787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42484997394 + 42484997395.

It is an arithmetic number, because the mean of its divisors is an integer number (42484997395).

Almost surely, 2^84969994789 is an apocalyptic number.

It is an amenable number.

84969994789 is a deficient number, since it is larger than the sum of its proper divisors (1).

84969994789 is an equidigital number, since it uses as much as digits as its factorization.

84969994789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2539579392, while the sum is 82.

The spelling of 84969994789 in words is "eighty-four billion, nine hundred sixty-nine million, nine hundred ninety-four thousand, seven hundred eighty-nine".