66803343678 has 40 divisors (see below), whose sum is σ = 149777183160. Its totient is φ = 22254659280.

The previous prime is 66803343653. The next prime is 66803343679. The reversal of 66803343678 is 87634330866.

66803343678 is a `hidden beast` number, since 66 + 80 + 3 + 3 + 436 + 78 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66803343679) 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 19 ways as a sum of consecutive naturals, for example, 156213 + ... + 397503.

It is an arithmetic number, because the mean of its divisors is an integer number (3744429579).

Almost surely, 2^66803343678 is an apocalyptic number.

66803343678 is an abundant number, since it is smaller than the sum of its proper divisors (82973839482).

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

66803343678 is a wasteful number, since it uses less digits than its factorization.

66803343678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243014 (or 243005 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 54.

The spelling of 66803343678 in words is "sixty-six billion, eight hundred three million, three hundred forty-three thousand, six hundred seventy-eight".