65866999966856 has 16 divisors (see below), whose sum is σ = 134727954477840. Its totient is φ = 29939545439440.

The previous prime is 65866999966853. The next prime is 65866999966861.

65866999966856 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (65866999966853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374244317906 + ... + 374244318081.

It is an arithmetic number, because the mean of its divisors is an integer number (8420497154865).

Almost surely, 2^{65866999966856} is an apocalyptic number.

It is an amenable number.

65866999966856 is an abundant number, since it is smaller than the sum of its proper divisors (68860954510984).

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

65866999966856 is a wasteful number, since it uses less digits than its factorization.

65866999966856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748488636004 (or 748488636000 counting only the distinct ones).

The product of its digits is 489776025600, while the sum is 98.

The spelling of 65866999966856 in words is "sixty-five trillion, eight hundred sixty-six billion, nine hundred ninety-nine million, nine hundred sixty-six thousand, eight hundred fifty-six".