65521312056 has 24 divisors (see below), whose sum is σ = 177453553680. Its totient is φ = 21840437328.

The previous prime is 65521311967. The next prime is 65521312091. The reversal of 65521312056 is 65021312556.

65521312056 is a `hidden beast` number, since 6 + 5 + 521 + 3 + 120 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 65521312056.

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 5 ways as a sum of consecutive naturals, for example, 455009040 + ... + 455009183.

It is an arithmetic number, because the mean of its divisors is an integer number (7393898070).

Almost surely, 2^65521312056 is an apocalyptic number.

It is an amenable number.

65521312056 is an abundant number, since it is smaller than the sum of its proper divisors (111932241624).

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

65521312056 is a wasteful number, since it uses less digits than its factorization.

65521312056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910018235 (or 910018228 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 65521312056 in words is "sixty-five billion, five hundred twenty-one million, three hundred twelve thousand, fifty-six".