65611059509 has 2 divisors, whose sum is σ = 65611059510. Its totient is φ = 65611059508.

The previous prime is 65611059439. The next prime is 65611059589. The reversal of 65611059509 is 90595011656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53417378884 + 12193680625 = 231122^2 + 110425^2 .

It is a cyclic number.

It is not a de Polignac number, because 65611059509 - 2³² = 61316092213 is a prime.

It is a super-2 number, since 2×65611059509² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65611059589) 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, 32805529754 + 32805529755.

It is an arithmetic number, because the mean of its divisors is an integer number (32805529755).

Almost surely, 2^65611059509 is an apocalyptic number.

It is an amenable number.

65611059509 is a deficient number, since it is larger than the sum of its proper divisors (1).

65611059509 is an equidigital number, since it uses as much as digits as its factorization.

65611059509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 364500, while the sum is 47.

The spelling of 65611059509 in words is "sixty-five billion, six hundred eleven million, fifty-nine thousand, five hundred nine".