866820788132 has 24 divisors (see below), whose sum is σ = 1639199329656. Its totient is φ = 398705695488.

The previous prime is 866820788131. The next prime is 866820788191. The reversal of 866820788132 is 231887028668.

866820788132 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 146739560356 + 720081227776 = 383066^2 + 848576^2 .

It is not an unprimeable number, because it can be changed into a prime (866820788131) 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, 28431233 + ... + 28461704.

It is an arithmetic number, because the mean of its divisors is an integer number (68299972069).

Almost surely, 2^866820788132 is an apocalyptic number.

It is an amenable number.

866820788132 is a deficient number, since it is larger than the sum of its proper divisors (772378541524).

866820788132 is a wasteful number, since it uses less digits than its factorization.

866820788132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56893247 (or 56893245 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 59.

The spelling of 866820788132 in words is "eight hundred sixty-six billion, eight hundred twenty million, seven hundred eighty-eight thousand, one hundred thirty-two".