65516516550 has 96 divisors (see below), whose sum is σ = 181451556000. Its totient is φ = 17382314880.

The previous prime is 65516516491. The next prime is 65516516567. The reversal of 65516516550 is 5561561556.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 65516516496 and 65516516505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142776 + ... + 389124.

It is an arithmetic number, because the mean of its divisors is an integer number (1890120375).

Almost surely, 2^65516516550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65516516550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90725778000).

65516516550 is an abundant number, since it is smaller than the sum of its proper divisors (115935039450).

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

65516516550 is a wasteful number, since it uses less digits than its factorization.

65516516550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246567 (or 246556 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 65516516550 in words is "sixty-five billion, five hundred sixteen million, five hundred sixteen thousand, five hundred fifty".