11503945165 has 8 divisors (see below), whose sum is σ = 14031041688. Its totient is φ = 9052284480.

The previous prime is 11503945163. The next prime is 11503945199. The reversal of 11503945165 is 56154930511.

11503945165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 482724841 + 11021220324 = 21971^2 + 104982^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11503945165 - 2¹ = 11503945163 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11503945163) 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 in 7 ways as a sum of consecutive naturals, for example, 18858622 + ... + 18859231.

It is an arithmetic number, because the mean of its divisors is an integer number (1753880211).

Almost surely, 2^11503945165 is an apocalyptic number.

It is an amenable number.

11503945165 is a deficient number, since it is larger than the sum of its proper divisors (2527096523).

11503945165 is an equidigital number, since it uses as much as digits as its factorization.

11503945165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37717919.

The product of its (nonzero) digits is 81000, while the sum is 40.

The spelling of 11503945165 in words is "eleven billion, five hundred three million, nine hundred forty-five thousand, one hundred sixty-five".