66800674028 has 24 divisors (see below), whose sum is σ = 129934763280. Its totient is φ = 29791037120.

The previous prime is 66800674027. The next prime is 66800674049. The reversal of 66800674028 is 82047600866.

It is a super-2 number, since 2×66800674028² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66800674027) 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, 14320283 + ... + 14324946.

It is an arithmetic number, because the mean of its divisors is an integer number (5413948470).

Almost surely, 2^66800674028 is an apocalyptic number.

It is an amenable number.

66800674028 is a deficient number, since it is larger than the sum of its proper divisors (63134089252).

66800674028 is a wasteful number, since it uses less digits than its factorization.

66800674028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28645297 (or 28645295 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 66800674028 in words is "sixty-six billion, eight hundred million, six hundred seventy-four thousand, twenty-eight".