12215256165 has 64 divisors (see below), whose sum is σ = 24985152000. Its totient is φ = 5546575872.

The previous prime is 12215256091. The next prime is 12215256169. The reversal of 12215256165 is 56165251221.

12215256165 is a `hidden beast` number, since 1 + 2 + 2 + 15 + 25 + 616 + 5 = 666.

It is not a de Polignac number, because 12215256165 - 2¹³ = 12215247973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215256169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 97429 + ... + 184181.

It is an arithmetic number, because the mean of its divisors is an integer number (390393000).

Almost surely, 2^12215256165 is an apocalyptic number.

12215256165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12215256165 is an abundant number, since it is smaller than the sum of its proper divisors (12769895835).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12215256165 is a wasteful number, since it uses less digits than its factorization.

12215256165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86923 (or 86917 counting only the distinct ones).

The product of its digits is 36000, while the sum is 36.

The spelling of 12215256165 in words is "twelve billion, two hundred fifteen million, two hundred fifty-six thousand, one hundred sixty-five".