8780787991009 has 2 divisors, whose sum is σ = 8780787991010. Its totient is φ = 8780787991008.

The previous prime is 8780787991007. The next prime is 8780787991051. The reversal of 8780787991009 is 9001997870878.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4843837560384 + 3936950430625 = 2200872^2 + 1984175^2 .

It is a cyclic number.

It is not a de Polignac number, because 8780787991009 - 2¹ = 8780787991007 is a prime.

Together with 8780787991007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (8780787991007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4390393995504 + 4390393995505.

It is an arithmetic number, because the mean of its divisors is an integer number (4390393995505).

Almost surely, 2^{8780787991009} is an apocalyptic number.

It is an amenable number.

8780787991009 is a deficient number, since it is larger than the sum of its proper divisors (1).

8780787991009 is an equidigital number, since it uses as much as digits as its factorization.

8780787991009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128024064, while the sum is 73.

The spelling of 8780787991009 in words is "eight trillion, seven hundred eighty billion, seven hundred eighty-seven million, nine hundred ninety-one thousand, nine".