66875857866 has 96 divisors (see below), whose sum is σ = 152054243328. Its totient is φ = 21221948160.

The previous prime is 66875857859. The next prime is 66875857877.

66875857866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66875857794 and 66875857803.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 6169071 + ... + 6179901.

It is an arithmetic number, because the mean of its divisors is an integer number (1583898368).

Almost surely, 2^66875857866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66875857866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76027121664).

66875857866 is an abundant number, since it is smaller than the sum of its proper divisors (85178385462).

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

66875857866 is a wasteful number, since it uses less digits than its factorization.

66875857866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11076 (or 11073 counting only the distinct ones).

The product of its digits is 812851200, while the sum is 72.

The spelling of 66875857866 in words is "sixty-six billion, eight hundred seventy-five million, eight hundred fifty-seven thousand, eight hundred sixty-six".