866788526375442 has 256 divisors, whose sum is σ = 2287183081996800. Its totient is φ = 240305881006080.

The previous prime is 866788526375441. The next prime is 866788526375449. The reversal of 866788526375442 is 244573625887668.

866788526375442 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 8 + 8 + 5 + 2 + 63 + 7 + 544 + 2 = 666.

It is a super-2 number, since 2×866788526375442² (a number of 31 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (866788526375441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 398321098 + ... + 400491290.

It is an arithmetic number, because the mean of its divisors is an integer number (8934308914050).

Almost surely, 2^{866788526375442} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866788526375442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1143591540998400).

866788526375442 is an abundant number, since it is smaller than the sum of its proper divisors (1420394555621358).

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

866788526375442 is a wasteful number, since it uses less digits than its factorization.

866788526375442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171338 (or 2171332 counting only the distinct ones).

The product of its digits is 26011238400, while the sum is 81.

The spelling of 866788526375442 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-six million, three hundred seventy-five thousand, four hundred forty-two".