12917780287665 has 64 divisors (see below), whose sum is σ = 23751076608000. Its totient is φ = 5929282598400.

The previous prime is 12917780287663. The next prime is 12917780287759. The reversal of 12917780287665 is 56678208771921.

It is not a de Polignac number, because 12917780287665 - 2¹ = 12917780287663 is a prime.

It is a super-3 number, since 3×12917780287665³ (a number of 40 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12917780287665.

It is not an unprimeable number, because it can be changed into a prime (12917780287661) 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, 2913205 + ... + 5858525.

It is an arithmetic number, because the mean of its divisors is an integer number (371110572000).

Almost surely, 2^{12917780287665} is an apocalyptic number.

12917780287665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12917780287665 is a deficient number, since it is larger than the sum of its proper divisors (10833296320335).

12917780287665 is a wasteful number, since it uses less digits than its factorization.

12917780287665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946758.

The product of its (nonzero) digits is 142248960, while the sum is 69.

The spelling of 12917780287665 in words is "twelve trillion, nine hundred seventeen billion, seven hundred eighty million, two hundred eighty-seven thousand, six hundred sixty-five".