65355860561 has 2 divisors, whose sum is σ = 65355860562. Its totient is φ = 65355860560.

The previous prime is 65355860551. The next prime is 65355860597. The reversal of 65355860561 is 16506855356.

65355860561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63854763025 + 1501097536 = 252695^2 + 38744^2 .

It is a cyclic number.

It is not a de Polignac number, because 65355860561 - 2¹⁰ = 65355859537 is a prime.

It is not a weakly prime, because it can be changed into another prime (65355860501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32677930280 + 32677930281.

It is an arithmetic number, because the mean of its divisors is an integer number (32677930281).

Almost surely, 2^65355860561 is an apocalyptic number.

It is an amenable number.

65355860561 is a deficient number, since it is larger than the sum of its proper divisors (1).

65355860561 is an equidigital number, since it uses as much as digits as its factorization.

65355860561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240000, while the sum is 50.

The spelling of 65355860561 in words is "sixty-five billion, three hundred fifty-five million, eight hundred sixty thousand, five hundred sixty-one".