8765320235681 has 2 divisors, whose sum is σ = 8765320235682. Its totient is φ = 8765320235680.

The previous prime is 8765320235647. The next prime is 8765320235687. The reversal of 8765320235681 is 1865320235678.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8649975095056 + 115345140625 = 2941084^2 + 339625^2 .

It is a cyclic number.

It is not a de Polignac number, because 8765320235681 - 2¹⁴ = 8765320219297 is a prime.

It is a super-2 number, since 2×8765320235681² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8765320235687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4382660117840 + 4382660117841.

It is an arithmetic number, because the mean of its divisors is an integer number (4382660117841).

Almost surely, 2^{8765320235681} is an apocalyptic number.

It is an amenable number.

8765320235681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8765320235681 is an equidigital number, since it uses as much as digits as its factorization.

8765320235681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14515200, while the sum is 56.

The spelling of 8765320235681 in words is "eight trillion, seven hundred sixty-five billion, three hundred twenty million, two hundred thirty-five thousand, six hundred eighty-one".