65561611 has 2 divisors, whose sum is σ = 65561612. Its totient is φ = 65561610.

The previous prime is 65561603. The next prime is 65561651. The reversal of 65561611 is 11616556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65561611 - 2³ = 65561603 is a prime.

It is not a weakly prime, because it can be changed into another prime (65561651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32780805 + 32780806.

It is an arithmetic number, because the mean of its divisors is an integer number (32780806).

Almost surely, 2^65561611 is an apocalyptic number.

65561611 is a deficient number, since it is larger than the sum of its proper divisors (1).

65561611 is an equidigital number, since it uses as much as digits as its factorization.

65561611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5400, while the sum is 31.

The square root of 65561611 is about 8097.0124737461. The cubic root of 65561611 is about 403.2272483941.

The spelling of 65561611 in words is "sixty-five million, five hundred sixty-one thousand, six hundred eleven".