861867012852 has 120 divisors (see below), whose sum is σ = 2289344238720. Its totient is φ = 282682370880.

The previous prime is 861867012823. The next prime is 861867012859. The reversal of 861867012852 is 258210768168.

861867012852 is a `hidden beast` number, since 8 + 618 + 6 + 7 + 0 + 12 + 8 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861867012859) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11672233 + ... + 11745839.

It is an arithmetic number, because the mean of its divisors is an integer number (19077868656).

Almost surely, 2^861867012852 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 861867012852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1144672119360).

861867012852 is an abundant number, since it is smaller than the sum of its proper divisors (1427477225868).

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

861867012852 is a wasteful number, since it uses less digits than its factorization.

861867012852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74203 (or 74192 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 861867012852 in words is "eight hundred sixty-one billion, eight hundred sixty-seven million, twelve thousand, eight hundred fifty-two".