84440804509 has 2 divisors, whose sum is σ = 84440804510. Its totient is φ = 84440804508.

The previous prime is 84440804501. The next prime is 84440804537. The reversal of 84440804509 is 90540804448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72905400100 + 11535404409 = 270010^2 + 107403^2 .

It is a cyclic number.

It is not a de Polignac number, because 84440804509 - 2³ = 84440804501 is a prime.

It is a super-2 number, since 2×84440804509² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84440804501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42220402254 + 42220402255.

It is an arithmetic number, because the mean of its divisors is an integer number (42220402255).

Almost surely, 2^84440804509 is an apocalyptic number.

It is an amenable number.

84440804509 is a deficient number, since it is larger than the sum of its proper divisors (1).

84440804509 is an equidigital number, since it uses as much as digits as its factorization.

84440804509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 84440804509 in words is "eighty-four billion, four hundred forty million, eight hundred four thousand, five hundred nine".