65611056561 has 16 divisors (see below), whose sum is σ = 87619172928. Its totient is φ = 43671873600.

The previous prime is 65611056541. The next prime is 65611056647. The reversal of 65611056561 is 16565011656.

It is not a de Polignac number, because 65611056561 - 2⁵ = 65611056529 is a prime.

It is a super-2 number, since 2×65611056561² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65611056541) 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 in 15 ways as a sum of consecutive naturals, for example, 6959631 + ... + 6969051.

It is an arithmetic number, because the mean of its divisors is an integer number (5476198308).

Almost surely, 2^65611056561 is an apocalyptic number.

It is an amenable number.

65611056561 is a deficient number, since it is larger than the sum of its proper divisors (22008116367).

65611056561 is a wasteful number, since it uses less digits than its factorization.

65611056561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12832.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 65611056561 in words is "sixty-five billion, six hundred eleven million, fifty-six thousand, five hundred sixty-one".