8765549084889 has 45 divisors (see below), whose sum is σ = 13148694149679. Its totient is φ = 5819487055200.

The previous prime is 8765549084843. The next prime is 8765549084921. The reversal of 8765549084889 is 9884809455678.

The square root of 8765549084889 is 2960667.

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

8765549084889 is a `hidden beast` number, since 8 + 7 + 6 + 5 + 5 + 490 + 8 + 48 + 89 = 666.

It can be written as a sum of positive squares in only one way, i.e., 55920425625 + 8709628659264 = 236475^2 + 2951208^2 .

It is not a de Polignac number, because 8765549084889 - 2¹⁵ = 8765549052121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is not an unprimeable number, because it can be changed into a prime (8765549084839) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 8340198414 + ... + 8340199464.

Almost surely, 2^{8765549084889} is an apocalyptic number.

8765549084889 is the 2960667-th square number.

8765549084889 is the 1480334-th centered octagonal number.

It is an amenable number.

8765549084889 is a deficient number, since it is larger than the sum of its proper divisors (4383145064790).

8765549084889 is an frugal number, since it uses more digits than its factorization.

8765549084889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740 (or 1367 counting only the distinct ones).

The product of its (nonzero) digits is 5573836800, while the sum is 81.

Multiplying 8765549084889 by its sum of digits (81), we get a square (710009475876009 = 26646003²).

8765549084889 divided by its sum of digits (81) gives a square (108216655369 = 328963²).

The spelling of 8765549084889 in words is "eight trillion, seven hundred sixty-five billion, five hundred forty-nine million, eighty-four thousand, eight hundred eighty-nine".