11987165285 has 8 divisors (see below), whose sum is σ = 14735442456. Its totient is φ = 9355836160.

The previous prime is 11987165263. The next prime is 11987165293. The reversal of 11987165285 is 58256178911.

11987165285 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 22743361 + 11964421924 = 4769^2 + 109382^2 .

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

It is not a de Polignac number, because 11987165285 - 2⁶ = 11987165221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 29236784 + ... + 29237193.

It is an arithmetic number, because the mean of its divisors is an integer number (1841930307).

Almost surely, 2^11987165285 is an apocalyptic number.

It is an amenable number.

11987165285 is a deficient number, since it is larger than the sum of its proper divisors (2748277171).

11987165285 is an equidigital number, since it uses as much as digits as its factorization.

11987165285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58474023.

The product of its digits is 1209600, while the sum is 53.

The spelling of 11987165285 in words is "eleven billion, nine hundred eighty-seven million, one hundred sixty-five thousand, two hundred eighty-five".