9866408695056 has 45 divisors (see below), whose sum is σ = 27612346489221. Its totient is φ = 3288790334016.

The previous prime is 9866408695049. The next prime is 9866408695109. The reversal of 9866408695056 is 6505968046689.

The square root of 9866408695056 is 3141084.

It is a perfect power (a square), and thus also a powerful number.

9866408695056 is a `hidden beast` number, since 9 + 8 + 66 + 408 + 69 + 50 + 56 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3668220867600 + 6198187827456 = 1915260^2 + 2489616^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 37562130 + ... + 37823886.

Almost surely, 2^{9866408695056} is an apocalyptic number.

9866408695056 is the 3141084-th square number.

It is an amenable number.

9866408695056 is an abundant number, since it is smaller than the sum of its proper divisors (17745937794165).

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

9866408695056 is an frugal number, since it uses more digits than its factorization.

9866408695056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523528 (or 261762 counting only the distinct ones).

The product of its (nonzero) digits is 671846400, while the sum is 72.

The spelling of 9866408695056 in words is "nine trillion, eight hundred sixty-six billion, four hundred eight million, six hundred ninety-five thousand, fifty-six".