12165550642305 has 16 divisors (see below), whose sum is σ = 21627645586560. Its totient is φ = 6488293675824.

The previous prime is 12165550642303. The next prime is 12165550642321. The reversal of 12165550642305 is 50324605556121.

12165550642305 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 5 + 550 + 64 + 2 + 30 + 5 = 666.

It is not a de Polignac number, because 12165550642305 - 2¹ = 12165550642303 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (12165550642303) 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, 45057594837 + ... + 45057595106.

It is an arithmetic number, because the mean of its divisors is an integer number (1351727849160).

Almost surely, 2^{12165550642305} is an apocalyptic number.

12165550642305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12165550642305 is a deficient number, since it is larger than the sum of its proper divisors (9462094944255).

12165550642305 is an equidigital number, since it uses as much as digits as its factorization.

12165550642305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90115189957 (or 90115189951 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The spelling of 12165550642305 in words is "twelve trillion, one hundred sixty-five billion, five hundred fifty million, six hundred forty-two thousand, three hundred five".