65730427561 has 2 divisors, whose sum is σ = 65730427562. Its totient is φ = 65730427560.

The previous prime is 65730427549. The next prime is 65730427577. The reversal of 65730427561 is 16572403756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63393671961 + 2336755600 = 251781^2 + 48340^2 .

It is a cyclic number.

It is not a de Polignac number, because 65730427561 - 2¹⁹ = 65729903273 is a prime.

It is not a weakly prime, because it can be changed into another prime (65730427531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32865213780 + 32865213781.

It is an arithmetic number, because the mean of its divisors is an integer number (32865213781).

Almost surely, 2^65730427561 is an apocalyptic number.

It is an amenable number.

65730427561 is a deficient number, since it is larger than the sum of its proper divisors (1).

65730427561 is an equidigital number, since it uses as much as digits as its factorization.

65730427561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 65730427561 in words is "sixty-five billion, seven hundred thirty million, four hundred twenty-seven thousand, five hundred sixty-one".