65561011 has 2 divisors, whose sum is σ = 65561012. Its totient is φ = 65561010.

The previous prime is 65560997. The next prime is 65561033. The reversal of 65561011 is 11016556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65561011 - 2⁹ = 65560499 is a prime.

It is not a weakly prime, because it can be changed into another prime (65561051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32780505 + 32780506.

It is an arithmetic number, because the mean of its divisors is an integer number (32780506).

Almost surely, 2^65561011 is an apocalyptic number.

65561011 is a deficient number, since it is larger than the sum of its proper divisors (1).

65561011 is an equidigital number, since it uses as much as digits as its factorization.

65561011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 65561011 is about 8096.9754229589. The cubic root of 65561011 is about 403.2260183191.

Adding to 65561011 its reverse (11016556), we get a palindrome (76577567).

The spelling of 65561011 in words is "sixty-five million, five hundred sixty-one thousand, eleven".