65611035521 has 2 divisors, whose sum is σ = 65611035522. Its totient is φ = 65611035520.

The previous prime is 65611035499. The next prime is 65611035533. The reversal of 65611035521 is 12553011656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34471492225 + 31139543296 = 185665^2 + 176464^2 .

It is a cyclic number.

It is not a de Polignac number, because 65611035521 - 2¹⁰ = 65611034497 is a prime.

It is not a weakly prime, because it can be changed into another prime (65611035221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32805517760 + 32805517761.

It is an arithmetic number, because the mean of its divisors is an integer number (32805517761).

Almost surely, 2^65611035521 is an apocalyptic number.

It is an amenable number.

65611035521 is a deficient number, since it is larger than the sum of its proper divisors (1).

65611035521 is an equidigital number, since it uses as much as digits as its factorization.

65611035521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 65611035521 in words is "sixty-five billion, six hundred eleven million, thirty-five thousand, five hundred twenty-one".