8020519561 has 2 divisors, whose sum is σ = 8020519562. Its totient is φ = 8020519560.

The previous prime is 8020519541. The next prime is 8020519631. The reversal of 8020519561 is 1659150208.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7767073161 + 253446400 = 88131^2 + 15920^2 .

It is a cyclic number.

It is not a de Polignac number, because 8020519561 - 2²¹ = 8018422409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8020519561.

It is not a weakly prime, because it can be changed into another prime (8020519541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4010259780 + 4010259781.

It is an arithmetic number, because the mean of its divisors is an integer number (4010259781).

Almost surely, 2^8020519561 is an apocalyptic number.

It is an amenable number.

8020519561 is a deficient number, since it is larger than the sum of its proper divisors (1).

8020519561 is an equidigital number, since it uses as much as digits as its factorization.

8020519561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 8020519561 is about 89557.3534725094. The cubic root of 8020519561 is about 2001.7085035090.

Adding to 8020519561 its reverse (1659150208), we get a palindrome (9679669769).

The spelling of 8020519561 in words is "eight billion, twenty million, five hundred nineteen thousand, five hundred sixty-one".