866871622012566 has 16 divisors (see below), whose sum is σ = 1759620008862144. Its totient is φ = 284644413198024.

The previous prime is 866871622012519. The next prime is 866871622012603. The reversal of 866871622012566 is 665210226178668.

It is a junction number, because it is equal to n+sod(n) for n = 866871622012497 and 866871622012506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1078198534440 + ... + 1078198535243.

It is an arithmetic number, because the mean of its divisors is an integer number (109976250553884).

Almost surely, 2^{866871622012566} is an apocalyptic number.

866871622012566 is an abundant number, since it is smaller than the sum of its proper divisors (892748386849578).

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

866871622012566 is a wasteful number, since it uses less digits than its factorization.

866871622012566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156397069755.

The product of its (nonzero) digits is 139345920, while the sum is 66.

The spelling of 866871622012566 in words is "eight hundred sixty-six trillion, eight hundred seventy-one billion, six hundred twenty-two million, twelve thousand, five hundred sixty-six".