65815855848 has 24 divisors (see below), whose sum is σ = 178251276450. Its totient is φ = 21938618592.

The previous prime is 65815855789. The next prime is 65815855849. The reversal of 65815855848 is 84855851856.

It is a happy number.

65815855848 is a `hidden beast` number, since 6 + 5 + 8 + 1 + 585 + 5 + 8 + 48 = 666.

It can be written as a sum of positive squares in only one way, i.e., 48718201284 + 17097654564 = 220722^2 + 130758^2 .

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

It is not an unprimeable number, because it can be changed into a prime (65815855849) by changing a digit.

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, 457054483 + ... + 457054626.

Almost surely, 2^65815855848 is an apocalyptic number.

It is an amenable number.

65815855848 is an abundant number, since it is smaller than the sum of its proper divisors (112435420602).

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

65815855848 is a wasteful number, since it uses less digits than its factorization.

65815855848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 914109121 (or 914109114 counting only the distinct ones).

The product of its digits is 61440000, while the sum is 63.

The spelling of 65815855848 in words is "sixty-five billion, eight hundred fifteen million, eight hundred fifty-five thousand, eight hundred forty-eight".