866761275836656 has 20 divisors (see below), whose sum is σ = 1696662858245152. Its totient is φ = 428912796289536.

The previous prime is 866761275836641. The next prime is 866761275836657. The reversal of 866761275836656 is 656638572167668.

It is a self number, because there is not a number n which added to its sum of digits gives 866761275836656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866761275836657) 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, 279240100200 + ... + 279240103303.

Almost surely, 2^{866761275836656} is an apocalyptic number.

It is an amenable number.

866761275836656 is a deficient number, since it is larger than the sum of its proper divisors (829901582408496).

866761275836656 is a wasteful number, since it uses less digits than its factorization.

866761275836656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558480203608 (or 558480203602 counting only the distinct ones).

The product of its digits is 21946982400, while the sum is 82.

The spelling of 866761275836656 in words is "eight hundred sixty-six trillion, seven hundred sixty-one billion, two hundred seventy-five million, eight hundred thirty-six thousand, six hundred fifty-six".