12817766501565 has 16 divisors (see below), whose sum is σ = 20700093941568. Its totient is φ = 6772252954496.

The previous prime is 12817766501563. The next prime is 12817766501597. The reversal of 12817766501565 is 56510566771821.

It is a cyclic number.

It is not a de Polignac number, because 12817766501565 - 2¹ = 12817766501563 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12817766501499 and 12817766501508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12817766501563) 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, 3993072072 + ... + 3993075281.

It is an arithmetic number, because the mean of its divisors is an integer number (1293755871348).

Almost surely, 2^{12817766501565} is an apocalyptic number.

12817766501565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12817766501565 is a deficient number, since it is larger than the sum of its proper divisors (7882327440003).

12817766501565 is a wasteful number, since it uses less digits than its factorization.

12817766501565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7986147468.

The product of its (nonzero) digits is 21168000, while the sum is 60.

The spelling of 12817766501565 in words is "twelve trillion, eight hundred seventeen billion, seven hundred sixty-six million, five hundred one thousand, five hundred sixty-five".