866788524481672 has 128 divisors (see below), whose sum is σ = 1765838200896000. Its totient is φ = 396504357322752.

The previous prime is 866788524481667. The next prime is 866788524481739. The reversal of 866788524481672 is 276184425887668.

It is a super-2 number, since 2×866788524481672² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 66354469813 + ... + 66354482875.

It is an arithmetic number, because the mean of its divisors is an integer number (13795610944500).

Almost surely, 2^{866788524481672} 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 866788524481672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882919100448000).

866788524481672 is an abundant number, since it is smaller than the sum of its proper divisors (899049676414328).

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

866788524481672 is a wasteful number, since it uses less digits than its factorization.

866788524481672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22247 (or 22243 counting only the distinct ones).

The product of its digits is 13872660480, while the sum is 82.

The spelling of 866788524481672 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred twenty-four million, four hundred eighty-one thousand, six hundred seventy-two".