6500260721 has 2 divisors, whose sum is σ = 6500260722. Its totient is φ = 6500260720.

The previous prime is 6500260649. The next prime is 6500260727. The reversal of 6500260721 is 1270620056.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5431690000 + 1068570721 = 73700^2 + 32689^2 .

It is a cyclic number.

It is not a de Polignac number, because 6500260721 - 2²² = 6496066417 is a prime.

It is not a weakly prime, because it can be changed into another prime (6500260727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3250130360 + 3250130361.

It is an arithmetic number, because the mean of its divisors is an integer number (3250130361).

Almost surely, 2^6500260721 is an apocalyptic number.

It is an amenable number.

6500260721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6500260721 is an equidigital number, since it uses as much as digits as its factorization.

6500260721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 6500260721 is about 80624.1943897736. The cubic root of 6500260721 is about 1866.2805304863.

Adding to 6500260721 its reverse (1270620056), we get a palindrome (7770880777).

The spelling of 6500260721 in words is "six billion, five hundred million, two hundred sixty thousand, seven hundred twenty-one".