12155566065 has 16 divisors (see below), whose sum is σ = 20472532800. Its totient is φ = 6141759552.

The previous prime is 12155566013. The next prime is 12155566091. The reversal of 12155566065 is 56066555121.

It is not a de Polignac number, because 12155566065 - 2⁶ = 12155566001 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21325270 + ... + 21325839.

It is an arithmetic number, because the mean of its divisors is an integer number (1279533300).

Almost surely, 2^12155566065 is an apocalyptic number.

12155566065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12155566065 is a deficient number, since it is larger than the sum of its proper divisors (8316966735).

12155566065 is a wasteful number, since it uses less digits than its factorization.

12155566065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42651136.

The product of its (nonzero) digits is 270000, while the sum is 42.

The spelling of 12155566065 in words is "twelve billion, one hundred fifty-five million, five hundred sixty-six thousand, sixty-five".