16664717123587 has 4 divisors (see below), whose sum is σ = 17946618440800. Its totient is φ = 15382815806376.

The previous prime is 16664717123519. The next prime is 16664717123599. The reversal of 16664717123587 is 78532171746661.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16664717123587 - 2⁴³ = 7868624101379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16664717193587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640950658587 + ... + 640950658612.

It is an arithmetic number, because the mean of its divisors is an integer number (4486654610200).

Almost surely, 2^{16664717123587} is an apocalyptic number.

16664717123587 is a deficient number, since it is larger than the sum of its proper divisors (1281901317213).

16664717123587 is a wasteful number, since it uses less digits than its factorization.

16664717123587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281901317212.

The product of its digits is 71124480, while the sum is 64.

The spelling of 16664717123587 in words is "sixteen trillion, six hundred sixty-four billion, seven hundred seventeen million, one hundred twenty-three thousand, five hundred eighty-seven".