8320856776389 has 20 divisors (see below), whose sum is σ = 13161093726924. Its totient is φ = 5220929741184.

The previous prime is 8320856776381. The next prime is 8320856776439. The reversal of 8320856776389 is 9836776580238.

It is a happy number.

8320856776389 is a `hidden beast` number, since 8 + 3 + 20 + 8 + 567 + 7 + 6 + 38 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6768104027364 + 1552752749025 = 2601558^2 + 1246095^2 .

It is not a de Polignac number, because 8320856776389 - 2³ = 8320856776381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8320856776381) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3021370002 + ... + 3021372755.

Almost surely, 2^{8320856776389} is an apocalyptic number.

It is an amenable number.

8320856776389 is a deficient number, since it is larger than the sum of its proper divisors (4840236950535).

8320856776389 is a wasteful number, since it uses less digits than its factorization.

8320856776389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6042742786 (or 6042742777 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 72.

It can be divided in two parts, 8320856 and 776389, that added together give a triangular number (9097245 = T₄₂₆₅).

The spelling of 8320856776389 in words is "eight trillion, three hundred twenty billion, eight hundred fifty-six million, seven hundred seventy-six thousand, three hundred eighty-nine".