65561560566516 has 48 divisors (see below), whose sum is σ = 194256475754880. Its totient is φ = 18731874447360.

The previous prime is 65561560566479. The next prime is 65561560566527. The reversal of 65561560566516 is 61566506516556.

65561560566516 is a `hidden beast` number, since 6 + 5 + 5 + 6 + 1 + 5 + 60 + 56 + 6 + 516 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43360819725 + ... + 43360821236.

It is an arithmetic number, because the mean of its divisors is an integer number (4047009911560).

Almost surely, 2^{65561560566516} is an apocalyptic number.

It is an amenable number.

65561560566516 is an abundant number, since it is smaller than the sum of its proper divisors (128694915188364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65561560566516 is a wasteful number, since it uses less digits than its factorization.

65561560566516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86721640981 (or 86721640973 counting only the distinct ones).

The product of its (nonzero) digits is 145800000, while the sum is 63.

The spelling of 65561560566516 in words is "sixty-five trillion, five hundred sixty-one billion, five hundred sixty million, five hundred sixty-six thousand, five hundred sixteen".