84165784849 has 2 divisors, whose sum is σ = 84165784850. Its totient is φ = 84165784848.

The previous prime is 84165784751. The next prime is 84165784949. The reversal of 84165784849 is 94848756148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82897926400 + 1267858449 = 287920^2 + 35607^2 .

It is a cyclic number.

It is not a de Polignac number, because 84165784849 - 2²¹ = 84163687697 is a prime.

It is not a weakly prime, because it can be changed into another prime (84165784949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42082892424 + 42082892425.

It is an arithmetic number, because the mean of its divisors is an integer number (42082892425).

Almost surely, 2^84165784849 is an apocalyptic number.

It is an amenable number.

84165784849 is a deficient number, since it is larger than the sum of its proper divisors (1).

84165784849 is an equidigital number, since it uses as much as digits as its factorization.

84165784849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61931520, while the sum is 64.

The spelling of 84165784849 in words is "eighty-four billion, one hundred sixty-five million, seven hundred eighty-four thousand, eight hundred forty-nine".