65520549816 has 64 divisors (see below), whose sum is σ = 169836480000. Its totient is φ = 21038941056.

The previous prime is 65520549761. The next prime is 65520549833. The reversal of 65520549816 is 61894502556.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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, 198325 + ... + 412763.

It is an arithmetic number, because the mean of its divisors is an integer number (2653695000).

Almost surely, 2^65520549816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65520549816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84918240000).

65520549816 is an abundant number, since it is smaller than the sum of its proper divisors (104315930184).

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

65520549816 is a wasteful number, since it uses less digits than its factorization.

65520549816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214916 (or 214912 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 51.

The spelling of 65520549816 in words is "sixty-five billion, five hundred twenty million, five hundred forty-nine thousand, eight hundred sixteen".