8518921553 has 2 divisors, whose sum is σ = 8518921554. Its totient is φ = 8518921552.

The previous prime is 8518921429. The next prime is 8518921573. The reversal of 8518921553 is 3551298158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7908189184 + 610732369 = 88928^2 + 24713^2 .

It is a cyclic number.

It is not a de Polignac number, because 8518921553 - 2¹⁴ = 8518905169 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8518921498 and 8518921507.

It is not a weakly prime, because it can be changed into another prime (8518921573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4259460776 + 4259460777.

It is an arithmetic number, because the mean of its divisors is an integer number (4259460777).

Almost surely, 2^8518921553 is an apocalyptic number.

It is an amenable number.

8518921553 is a deficient number, since it is larger than the sum of its proper divisors (1).

8518921553 is an equidigital number, since it uses as much as digits as its factorization.

8518921553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432000, while the sum is 47.

The square root of 8518921553 is about 92298.0040575093. The cubic root of 8518921553 is about 2042.3407669752.

The spelling of 8518921553 in words is "eight billion, five hundred eighteen million, nine hundred twenty-one thousand, five hundred fifty-three".