84405884609 has 2 divisors, whose sum is σ = 84405884610. Its totient is φ = 84405884608.

The previous prime is 84405884597. The next prime is 84405884671. The reversal of 84405884609 is 90648850448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77658083584 + 6747801025 = 278672^2 + 82145^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84405884609 is a prime.

It is not a weakly prime, because it can be changed into another prime (84405884509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42202942304 + 42202942305.

It is an arithmetic number, because the mean of its divisors is an integer number (42202942305).

Almost surely, 2^84405884609 is an apocalyptic number.

It is an amenable number.

84405884609 is a deficient number, since it is larger than the sum of its proper divisors (1).

84405884609 is an equidigital number, since it uses as much as digits as its factorization.

84405884609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8847360, while the sum is 56.

The spelling of 84405884609 in words is "eighty-four billion, four hundred five million, eight hundred eighty-four thousand, six hundred nine".