11945205109 has 2 divisors, whose sum is σ = 11945205110. Its totient is φ = 11945205108.

The previous prime is 11945205073. The next prime is 11945205119. The reversal of 11945205109 is 90150254911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9664856100 + 2280349009 = 98310^2 + 47753^2 .

It is a cyclic number.

It is not a de Polignac number, because 11945205109 - 2²³ = 11936816501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11945205119) 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, 5972602554 + 5972602555.

It is an arithmetic number, because the mean of its divisors is an integer number (5972602555).

Almost surely, 2^11945205109 is an apocalyptic number.

It is an amenable number.

11945205109 is a deficient number, since it is larger than the sum of its proper divisors (1).

11945205109 is an equidigital number, since it uses as much as digits as its factorization.

11945205109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 37.

The spelling of 11945205109 in words is "eleven billion, nine hundred forty-five million, two hundred five thousand, one hundred nine".