66784504711517 has 8 divisors (see below), whose sum is σ = 66796280589024. Its totient is φ = 66772729816848.

The previous prime is 66784504711469. The next prime is 66784504711523. The reversal of 66784504711517 is 71511740548766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66784504711517 - 2¹⁰ = 66784504710493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66784504711517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66784504711117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142932758 + ... + 143399240.

It is an arithmetic number, because the mean of its divisors is an integer number (8349535073628).

Almost surely, 2^{66784504711517} is an apocalyptic number.

It is an amenable number.

66784504711517 is a deficient number, since it is larger than the sum of its proper divisors (11775877507).

66784504711517 is a wasteful number, since it uses less digits than its factorization.

66784504711517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491419.

The product of its (nonzero) digits is 39513600, while the sum is 62.

The spelling of 66784504711517 in words is "sixty-six trillion, seven hundred eighty-four billion, five hundred four million, seven hundred eleven thousand, five hundred seventeen".