6511966261 has 2 divisors, whose sum is σ = 6511966262. Its totient is φ = 6511966260.

The previous prime is 6511966259. The next prime is 6511966271. The reversal of 6511966261 is 1626691156.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6188182225 + 323784036 = 78665^2 + 17994^2 .

It is a cyclic number.

It is not a de Polignac number, because 6511966261 - 2¹ = 6511966259 is a prime.

Together with 6511966259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6511966271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3255983130 + 3255983131.

It is an arithmetic number, because the mean of its divisors is an integer number (3255983131).

Almost surely, 2^6511966261 is an apocalyptic number.

It is an amenable number.

6511966261 is a deficient number, since it is larger than the sum of its proper divisors (1).

6511966261 is an equidigital number, since it uses as much as digits as its factorization.

6511966261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 6511966261 is about 80696.7549595397. The cubic root of 6511966261 is about 1867.4001123138.

The spelling of 6511966261 in words is "six billion, five hundred eleven million, nine hundred sixty-six thousand, two hundred sixty-one".