65245548521 has 2 divisors, whose sum is σ = 65245548522. Its totient is φ = 65245548520.

The previous prime is 65245548461. The next prime is 65245548593. The reversal of 65245548521 is 12584554256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63926042896 + 1319505625 = 252836^2 + 36325^2 .

It is a cyclic number.

It is not a de Polignac number, because 65245548521 - 2²⁶ = 65178439657 is a prime.

It is not a weakly prime, because it can be changed into another prime (65245508521) 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, 32622774260 + 32622774261.

It is an arithmetic number, because the mean of its divisors is an integer number (32622774261).

Almost surely, 2^65245548521 is an apocalyptic number.

It is an amenable number.

65245548521 is a deficient number, since it is larger than the sum of its proper divisors (1).

65245548521 is an equidigital number, since it uses as much as digits as its factorization.

65245548521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920000, while the sum is 47.

The spelling of 65245548521 in words is "sixty-five billion, two hundred forty-five million, five hundred forty-eight thousand, five hundred twenty-one".