84606765209 has 2 divisors, whose sum is σ = 84606765210. Its totient is φ = 84606765208.

The previous prime is 84606765203. The next prime is 84606765241. The reversal of 84606765209 is 90256760648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49035673600 + 35571091609 = 221440^2 + 188603^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84606765209 is a prime.

It is not a weakly prime, because it can be changed into another prime (84606765203) 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, 42303382604 + 42303382605.

It is an arithmetic number, because the mean of its divisors is an integer number (42303382605).

Almost surely, 2^84606765209 is an apocalyptic number.

It is an amenable number.

84606765209 is a deficient number, since it is larger than the sum of its proper divisors (1).

84606765209 is an equidigital number, since it uses as much as digits as its factorization.

84606765209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 84606765209 in words is "eighty-four billion, six hundred six million, seven hundred sixty-five thousand, two hundred nine".