6501661273 has 2 divisors, whose sum is σ = 6501661274. Its totient is φ = 6501661272.

The previous prime is 6501661259. The next prime is 6501661297. The reversal of 6501661273 is 3721661056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6186137104 + 315524169 = 78652^2 + 17763^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6501661273 is a prime.

It is not a weakly prime, because it can be changed into another prime (6501601273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3250830636 + 3250830637.

It is an arithmetic number, because the mean of its divisors is an integer number (3250830637).

Almost surely, 2^6501661273 is an apocalyptic number.

It is an amenable number.

6501661273 is a deficient number, since it is larger than the sum of its proper divisors (1).

6501661273 is an equidigital number, since it uses as much as digits as its factorization.

6501661273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 6501661273 is about 80632.8796025542. The cubic root of 6501661273 is about 1866.4145576861.

The spelling of 6501661273 in words is "six billion, five hundred one million, six hundred sixty-one thousand, two hundred seventy-three".