817660066718 has 16 divisors (see below), whose sum is σ = 1350264334320. Its totient is φ = 368253907200.

The previous prime is 817660066703. The next prime is 817660066777.

817660066718 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×817660066718² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170485523 + ... + 170490318.

It is an arithmetic number, because the mean of its divisors is an integer number (84391520895).

Almost surely, 2^817660066718 is an apocalyptic number.

817660066718 is a deficient number, since it is larger than the sum of its proper divisors (532604267602).

817660066718 is a wasteful number, since it uses less digits than its factorization.

817660066718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340975963.

The product of its (nonzero) digits is 4064256, while the sum is 56.

The spelling of 817660066718 in words is "eight hundred seventeen billion, six hundred sixty million, sixty-six thousand, seven hundred eighteen".