11865065831 has 4 divisors (see below), whose sum is σ = 12489543000. Its totient is φ = 11240588664.

The previous prime is 11865065801. The next prime is 11865065857. The reversal of 11865065831 is 13856056811.

It is a happy number.

11865065831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13856056811 = 70529 ⋅196459.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11865065831 is a prime.

It is a super-2 number, since 2×11865065831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11865065801) 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 3 ways as a sum of consecutive naturals, for example, 312238556 + ... + 312238593.

It is an arithmetic number, because the mean of its divisors is an integer number (3122385750).

Almost surely, 2^11865065831 is an apocalyptic number.

11865065831 is a deficient number, since it is larger than the sum of its proper divisors (624477169).

11865065831 is an equidigital number, since it uses as much as digits as its factorization.

11865065831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624477168.

The product of its (nonzero) digits is 172800, while the sum is 44.

It can be divided in two parts, 118650 and 65831, that added together give a palindrome (184481).

The spelling of 11865065831 in words is "eleven billion, eight hundred sixty-five million, sixty-five thousand, eight hundred thirty-one".