66808822240864 has 72 divisors (see below), whose sum is σ = 145712533526784. Its totient is φ = 30128530924800.

The previous prime is 66808822240817. The next prime is 66808822240879. The reversal of 66808822240864 is 46804222880866.

It is a super-2 number, since 2×66808822240864² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66808822240796 and 66808822240805.

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 11 ways as a sum of consecutive naturals, for example, 67438747 + ... + 68422234.

It is an arithmetic number, because the mean of its divisors is an integer number (2023785187872).

Almost surely, 2^{66808822240864} is an apocalyptic number.

It is an amenable number.

66808822240864 is an abundant number, since it is smaller than the sum of its proper divisors (78903711285920).

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

66808822240864 is a wasteful number, since it uses less digits than its factorization.

66808822240864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135861140 (or 135861121 counting only the distinct ones).

The product of its (nonzero) digits is 113246208, while the sum is 64.

The spelling of 66808822240864 in words is "sixty-six trillion, eight hundred eight billion, eight hundred twenty-two million, two hundred forty thousand, eight hundred sixty-four".