6465225661 has 2 divisors, whose sum is σ = 6465225662. Its totient is φ = 6465225660.

The previous prime is 6465225623. The next prime is 6465225691. The reversal of 6465225661 is 1665225646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3578312761 + 2886912900 = 59819^2 + 53730^2 .

It is a cyclic number.

It is not a de Polignac number, because 6465225661 - 2⁹ = 6465225149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6465225691) 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, 3232612830 + 3232612831.

It is an arithmetic number, because the mean of its divisors is an integer number (3232612831).

Almost surely, 2^6465225661 is an apocalyptic number.

It is an amenable number.

6465225661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6465225661 is an equidigital number, since it uses as much as digits as its factorization.

6465225661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 518400, while the sum is 43.

The square root of 6465225661 is about 80406.6269719107. The cubic root of 6465225661 is about 1862.9215332000.

The spelling of 6465225661 in words is "six billion, four hundred sixty-five million, two hundred twenty-five thousand, six hundred sixty-one".