65220641 has 2 divisors, whose sum is σ = 65220642. Its totient is φ = 65220640.

The previous prime is 65220613. The next prime is 65220647. The reversal of 65220641 is 14602256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44609041 + 20611600 = 6679^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 65220641 - 2¹⁸ = 64958497 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65220641.

It is not a weakly prime, because it can be changed into another prime (65220647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32610320 + 32610321.

It is an arithmetic number, because the mean of its divisors is an integer number (32610321).

Almost surely, 2^65220641 is an apocalyptic number.

It is an amenable number.

65220641 is a deficient number, since it is larger than the sum of its proper divisors (1).

65220641 is an equidigital number, since it uses as much as digits as its factorization.

65220641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 65220641 is about 8075.9297297587. The cubic root of 65220641 is about 402.5270040908.

Adding to 65220641 its reverse (14602256), we get a palindrome (79822897).

The spelling of 65220641 in words is "sixty-five million, two hundred twenty thousand, six hundred forty-one".