12165723831 has 16 divisors (see below), whose sum is σ = 16566750720. Its totient is φ = 7938770880.

The previous prime is 12165723761. The next prime is 12165723847. The reversal of 12165723831 is 13832756121.

It is a happy number.

It is not a de Polignac number, because 12165723831 - 2¹⁷ = 12165592759 is a prime.

It is a super-2 number, since 2×12165723831² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12165723831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12165723331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106255 + ... + 188736.

It is an arithmetic number, because the mean of its divisors is an integer number (1035421920).

Almost surely, 2^12165723831 is an apocalyptic number.

12165723831 is a deficient number, since it is larger than the sum of its proper divisors (4401026889).

12165723831 is a wasteful number, since it uses less digits than its factorization.

12165723831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295286.

The product of its digits is 60480, while the sum is 39.

The spelling of 12165723831 in words is "twelve billion, one hundred sixty-five million, seven hundred twenty-three thousand, eight hundred thirty-one".