866247021052 has 48 divisors (see below), whose sum is σ = 1789768529920. Its totient is φ = 358994203200.

The previous prime is 866247021047. The next prime is 866247021053. The reversal of 866247021052 is 250120742668.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866247021053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 734074 + ... + 1507102.

Almost surely, 2^866247021052 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 866247021052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (894884264960).

866247021052 is an abundant number, since it is smaller than the sum of its proper divisors (923521508868).

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

866247021052 is a wasteful number, since it uses less digits than its factorization.

866247021052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774362 (or 774360 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 866247021052 in words is "eight hundred sixty-six billion, two hundred forty-seven million, twenty-one thousand, fifty-two".