12171165498789 has 64 divisors (see below), whose sum is σ = 19454819328000. Its totient is φ = 6681191774400.

The previous prime is 12171165498673. The next prime is 12171165498803. The reversal of 12171165498789 is 98789456117121.

It is not a de Polignac number, because 12171165498789 - 2²⁰ = 12171164450213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12171165493789) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30068634 + ... + 30470724.

It is an arithmetic number, because the mean of its divisors is an integer number (303981552000).

Almost surely, 2^{12171165498789} is an apocalyptic number.

12171165498789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

12171165498789 is a deficient number, since it is larger than the sum of its proper divisors (7283653829211).

12171165498789 is a wasteful number, since it uses less digits than its factorization.

12171165498789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404246.

The product of its digits is 60963840, while the sum is 69.

The spelling of 12171165498789 in words is "twelve trillion, one hundred seventy-one billion, one hundred sixty-five million, four hundred ninety-eight thousand, seven hundred eighty-nine".