866680228866 has 16 divisors (see below), whose sum is σ = 1734955098624. Its totient is φ = 288627636144.

The previous prime is 866680228787. The next prime is 866680228867. The reversal of 866680228866 is 668822086668.

It is a super-2 number, since 2×866680228866² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866680228797 and 866680228806.

It is not an unprimeable number, because it can be changed into a prime (866680228867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66436305 + ... + 66449348.

It is an arithmetic number, because the mean of its divisors is an integer number (108434693664).

Almost surely, 2^866680228866 is an apocalyptic number.

866680228866 is an abundant number, since it is smaller than the sum of its proper divisors (868274869758).

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

866680228866 is a wasteful number, since it uses less digits than its factorization.

866680228866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132886745.

The product of its (nonzero) digits is 127401984, while the sum is 66.

The spelling of 866680228866 in words is "eight hundred sixty-six billion, six hundred eighty million, two hundred twenty-eight thousand, eight hundred sixty-six".