66856065866 has 8 divisors (see below), whose sum is σ = 103519069824. Its totient is φ = 32349709260.

The previous prime is 66856065821. The next prime is 66856065883.

66856065866 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (62), and also a Moran number because the ratio is a prime number: 1078323643 = 66856065866 / (6 + 6 + 8 + 5 + 6 + 0 + 6 + 5 + 8 + 6 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 66856065799 and 66856065808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 539161760 + ... + 539161883.

It is an arithmetic number, because the mean of its divisors is an integer number (12939883728).

Almost surely, 2^66856065866 is an apocalyptic number.

66856065866 is a deficient number, since it is larger than the sum of its proper divisors (36663003958).

66856065866 is a wasteful number, since it uses less digits than its factorization.

66856065866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078323676.

The product of its (nonzero) digits is 74649600, while the sum is 62.

The spelling of 66856065866 in words is "sixty-six billion, eight hundred fifty-six million, sixty-five thousand, eight hundred sixty-six".