8663751780666 has 32 divisors (see below), whose sum is σ = 17703172773888. Its totient is φ = 2825928725760.

The previous prime is 8663751780659. The next prime is 8663751780689. The reversal of 8663751780666 is 6660871573668.

It is a self number, because there is not a number n which added to its sum of digits gives 8663751780666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77819395 + ... + 77930646.

It is an arithmetic number, because the mean of its divisors is an integer number (553224149184).

Almost surely, 2^{8663751780666} is an apocalyptic number.

8663751780666 is an abundant number, since it is smaller than the sum of its proper divisors (9039420993222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8663751780666 is a wasteful number, since it uses less digits than its factorization.

8663751780666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155750246.

The product of its (nonzero) digits is 365783040, while the sum is 69.

The spelling of 8663751780666 in words is "eight trillion, six hundred sixty-three billion, seven hundred fifty-one million, seven hundred eighty thousand, six hundred sixty-six".