188153089909 has 2 divisors, whose sum is σ = 188153089910. Its totient is φ = 188153089908.

The previous prime is 188153089853. The next prime is 188153089931. The reversal of 188153089909 is 909980351881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163110976900 + 25042113009 = 403870^2 + 158247^2 .

It is a cyclic number.

It is not a de Polignac number, because 188153089909 - 2²³ = 188144701301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188153087909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94076544954 + 94076544955.

It is an arithmetic number, because the mean of its divisors is an integer number (94076544955).

Almost surely, 2^188153089909 is an apocalyptic number.

It is an amenable number.

188153089909 is a deficient number, since it is larger than the sum of its proper divisors (1).

188153089909 is an equidigital number, since it uses as much as digits as its factorization.

188153089909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5598720, while the sum is 61.

The spelling of 188153089909 in words is "one hundred eighty-eight billion, one hundred fifty-three million, eighty-nine thousand, nine hundred nine".