84661044509 has 2 divisors, whose sum is σ = 84661044510. Its totient is φ = 84661044508.

The previous prime is 84661044451. The next prime is 84661044551. The reversal of 84661044509 is 90544016648.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45476842009 + 39184202500 = 213253^2 + 197950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84661044509 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84661040509) 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, 42330522254 + 42330522255.

It is an arithmetic number, because the mean of its divisors is an integer number (42330522255).

Almost surely, 2^84661044509 is an apocalyptic number.

It is an amenable number.

84661044509 is a deficient number, since it is larger than the sum of its proper divisors (1).

84661044509 is an equidigital number, since it uses as much as digits as its factorization.

84661044509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 84661044509 in words is "eighty-four billion, six hundred sixty-one million, forty-four thousand, five hundred nine".