66849812848 has 40 divisors (see below), whose sum is σ = 159411095648. Its totient is φ = 26446079232.

The previous prime is 66849812839. The next prime is 66849812851. The reversal of 66849812848 is 84821894866.

It is a happy number.

It is a super-2 number, since 2×66849812848² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66849812848.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22955211 + ... + 22958122.

Almost surely, 2^66849812848 is an apocalyptic number.

It is an amenable number.

66849812848 is an abundant number, since it is smaller than the sum of its proper divisors (92561282800).

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

66849812848 is a wasteful number, since it uses less digits than its factorization.

66849812848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45913361 (or 45913355 counting only the distinct ones).

The product of its digits is 42467328, while the sum is 64.

The spelling of 66849812848 in words is "sixty-six billion, eight hundred forty-nine million, eight hundred twelve thousand, eight hundred forty-eight".