65561215613 has 16 divisors (see below), whose sum is σ = 68793265152. Its totient is φ = 62403264000.

The previous prime is 65561215591. The next prime is 65561215627. The reversal of 65561215613 is 31651216556.

65561215613 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 65561215613 - 2⁶ = 65561215549 is a prime.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65561215633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 891245 + ... + 961997.

It is an arithmetic number, because the mean of its divisors is an integer number (4299579072).

Almost surely, 2^65561215613 is an apocalyptic number.

It is an amenable number.

65561215613 is a deficient number, since it is larger than the sum of its proper divisors (3232049539).

65561215613 is a wasteful number, since it uses less digits than its factorization.

65561215613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71276.

The product of its digits is 162000, while the sum is 41.

The spelling of 65561215613 in words is "sixty-five billion, five hundred sixty-one million, two hundred fifteen thousand, six hundred thirteen".