8766491521 has 2 divisors, whose sum is σ = 8766491522. Its totient is φ = 8766491520.

The previous prime is 8766491509. The next prime is 8766491533. The reversal of 8766491521 is 1251946678.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (8766491509) and next prime (8766491533).

It can be written as a sum of positive squares in only one way, i.e., 6855840000 + 1910651521 = 82800^2 + 43711^2 .

It is a cyclic number.

It is not a de Polignac number, because 8766491521 - 2³³ = 176556929 is a prime.

It is not a weakly prime, because it can be changed into another prime (8766491021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4383245760 + 4383245761.

It is an arithmetic number, because the mean of its divisors is an integer number (4383245761).

Almost surely, 2^8766491521 is an apocalyptic number.

It is an amenable number.

8766491521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8766491521 is an equidigital number, since it uses as much as digits as its factorization.

8766491521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 49.

The square root of 8766491521 is about 93629.5440606222. The cubic root of 8766491521 is about 2061.9364329143.

The spelling of 8766491521 in words is "eight billion, seven hundred sixty-six million, four hundred ninety-one thousand, five hundred twenty-one".