65821055368 has 32 divisors (see below), whose sum is σ = 135558244800. Its totient is φ = 29822810688.

The previous prime is 65821055323. The next prime is 65821055369. The reversal of 65821055368 is 86355012856.

It is a super-2 number, since 2×65821055368² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65821055369) 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 7 ways as a sum of consecutive naturals, for example, 9410271 + ... + 9417262.

It is an arithmetic number, because the mean of its divisors is an integer number (4236195150).

Almost surely, 2^65821055368 is an apocalyptic number.

It is an amenable number.

65821055368 is an abundant number, since it is smaller than the sum of its proper divisors (69737189432).

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

65821055368 is a wasteful number, since it uses less digits than its factorization.

65821055368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18827581 (or 18827577 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 65821055368 in words is "sixty-five billion, eight hundred twenty-one million, fifty-five thousand, three hundred sixty-eight".