866511758461128 has 128 divisors (see below), whose sum is σ = 2346200552908800. Its totient is φ = 265101118214400.

The previous prime is 866511758461127. The next prime is 866511758461207. The reversal of 866511758461128 is 821164857115668.

It is not an unprimeable number, because it can be changed into a prime (866511758461127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 523642483 + ... + 525294653.

It is an arithmetic number, because the mean of its divisors is an integer number (18329691819600).

Almost surely, 2^{866511758461128} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866511758461128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1173100276454400).

866511758461128 is an abundant number, since it is smaller than the sum of its proper divisors (1479688794447672).

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

866511758461128 is a wasteful number, since it uses less digits than its factorization.

866511758461128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661763 (or 1661759 counting only the distinct ones).

The product of its digits is 154828800, while the sum is 69.

The spelling of 866511758461128 in words is "eight hundred sixty-six trillion, five hundred eleven billion, seven hundred fifty-eight million, four hundred sixty-one thousand, one hundred twenty-eight".