80188091609 has 2 divisors, whose sum is σ = 80188091610. Its totient is φ = 80188091608.

The previous prime is 80188091597. The next prime is 80188091671. The reversal of 80188091609 is 90619088108.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69364810384 + 10823281225 = 263372^2 + 104035^2 .

It is a cyclic number.

It is not a de Polignac number, because 80188091609 - 2²⁴ = 80171314393 is a prime.

It is not a weakly prime, because it can be changed into another prime (80188091699) 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, 40094045804 + 40094045805.

It is an arithmetic number, because the mean of its divisors is an integer number (40094045805).

Almost surely, 2^80188091609 is an apocalyptic number.

It is an amenable number.

80188091609 is a deficient number, since it is larger than the sum of its proper divisors (1).

80188091609 is an equidigital number, since it uses as much as digits as its factorization.

80188091609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 50.

The spelling of 80188091609 in words is "eighty billion, one hundred eighty-eight million, ninety-one thousand, six hundred nine".