12165516531 has 12 divisors (see below), whose sum is σ = 20082757552. Its totient is φ = 6951723696.

The previous prime is 12165516529. The next prime is 12165516541. The reversal of 12165516531 is 13561556121.

12165516531 is a `hidden beast` number, since 1 + 2 + 16 + 551 + 65 + 31 = 666.

It is not a de Polignac number, because 12165516531 - 2¹ = 12165516529 is a prime.

It is a super-2 number, since 2×12165516531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12165516511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96551656 + ... + 96551781.

Almost surely, 2^12165516531 is an apocalyptic number.

12165516531 is a deficient number, since it is larger than the sum of its proper divisors (7917241021).

12165516531 is a wasteful number, since it uses less digits than its factorization.

12165516531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193103450 (or 193103447 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The spelling of 12165516531 in words is "twelve billion, one hundred sixty-five million, five hundred sixteen thousand, five hundred thirty-one".