8784901366821 has 12 divisors (see below), whose sum is σ = 12691159124748. Its totient is φ = 5855743764864.

The previous prime is 8784901366799. The next prime is 8784901366847. The reversal of 8784901366821 is 1286631094878.

8784901366821 is a `hidden beast` number, since 8 + 7 + 8 + 490 + 1 + 3 + 66 + 82 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 654909840225 + 8129991526596 = 809265^2 + 2851314^2 .

It is not a de Polignac number, because 8784901366821 - 2³⁴ = 8767721497637 is a prime.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8784901366321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71363950 + ... + 71486943.

It is an arithmetic number, because the mean of its divisors is an integer number (1057596593729).

Almost surely, 2^{8784901366821} is an apocalyptic number.

It is an amenable number.

8784901366821 is a deficient number, since it is larger than the sum of its proper divisors (3906257757927).

8784901366821 is a wasteful number, since it uses less digits than its factorization.

8784901366821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142857732 (or 142857729 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 8784901366821 in words is "eight trillion, seven hundred eighty-four billion, nine hundred one million, three hundred sixty-six thousand, eight hundred twenty-one".