66820000678 has 4 divisors (see below), whose sum is σ = 100230001020. Its totient is φ = 33410000338.

The previous prime is 66820000673. The next prime is 66820000691. The reversal of 66820000678 is 87600002866.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66820000673) 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 as a sum of consecutive naturals, namely, 16705000168 + ... + 16705000171.

It is an arithmetic number, because the mean of its divisors is an integer number (25057500255).

Almost surely, 2^66820000678 is an apocalyptic number.

66820000678 is a deficient number, since it is larger than the sum of its proper divisors (33410000342).

66820000678 is a wasteful number, since it uses less digits than its factorization.

66820000678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33410000341.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 66820000678 in words is "sixty-six billion, eight hundred twenty million, six hundred seventy-eight", and thus it is an aban number.