65726561 has 2 divisors, whose sum is σ = 65726562. Its totient is φ = 65726560.

The previous prime is 65726537. The next prime is 65726579. The reversal of 65726561 is 16562756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54302161 + 11424400 = 7369^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 65726561 - 2⁶ = 65726497 is a prime.

It is not a weakly prime, because it can be changed into another prime (65726501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32863280 + 32863281.

It is an arithmetic number, because the mean of its divisors is an integer number (32863281).

Almost surely, 2^65726561 is an apocalyptic number.

It is an amenable number.

65726561 is a deficient number, since it is larger than the sum of its proper divisors (1).

65726561 is an equidigital number, since it uses as much as digits as its factorization.

65726561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 65726561 is about 8107.1919306255. The cubic root of 65726561 is about 403.5651322603.

The spelling of 65726561 in words is "sixty-five million, seven hundred twenty-six thousand, five hundred sixty-one".