66859246978 has 16 divisors (see below), whose sum is σ = 103474558080. Its totient is φ = 32383696176.

The previous prime is 66859246957. The next prime is 66859246997. The reversal of 66859246978 is 87964295866.

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, 3983700 + ... + 4000447.

It is an arithmetic number, because the mean of its divisors is an integer number (6467159880).

Almost surely, 2^66859246978 is an apocalyptic number.

66859246978 is a deficient number, since it is larger than the sum of its proper divisors (36615311102).

66859246978 is a wasteful number, since it uses less digits than its factorization.

66859246978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7984281.

The product of its digits is 313528320, while the sum is 70.

The spelling of 66859246978 in words is "sixty-six billion, eight hundred fifty-nine million, two hundred forty-six thousand, nine hundred seventy-eight".