11651937565 has 8 divisors (see below), whose sum is σ = 14030048088. Its totient is φ = 9289734720.

The previous prime is 11651937529. The next prime is 11651937569. The reversal of 11651937565 is 56573915611.

11651937565 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 1334660089 + 10317277476 = 36533^2 + 101574^2 .

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

It is not a de Polignac number, because 11651937565 - 2⁹ = 11651937053 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 (11651937569) 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, 3975306 + ... + 3978235.

It is an arithmetic number, because the mean of its divisors is an integer number (1753756011).

Almost surely, 2^11651937565 is an apocalyptic number.

It is an amenable number.

11651937565 is a deficient number, since it is larger than the sum of its proper divisors (2378110523).

11651937565 is an equidigital number, since it uses as much as digits as its factorization.

11651937565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7953839.

The product of its digits is 850500, while the sum is 49.

The spelling of 11651937565 in words is "eleven billion, six hundred fifty-one million, nine hundred thirty-seven thousand, five hundred sixty-five".