866158168453020 has 576 divisors, whose sum is σ = 2734537969852416. Its totient is φ = 221737126440960.

The previous prime is 866158168452959. The next prime is 866158168453027. The reversal of 866158168453020 is 20354861851668.

866158168453020 is a `hidden beast` number, since 8 + 6 + 6 + 1 + 5 + 8 + 16 + 84 + 530 + 2 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (866158168453027) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 254228988157 + ... + 254228991563.

It is an arithmetic number, because the mean of its divisors is an integer number (4747461753216).

Almost surely, 2^{866158168453020} 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 866158168453020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1367268984926208).

866158168453020 is an abundant number, since it is smaller than the sum of its proper divisors (1868379801399396).

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

866158168453020 is a wasteful number, since it uses less digits than its factorization.

866158168453020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810 (or 4805 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 63.

The spelling of 866158168453020 in words is "eight hundred sixty-six trillion, one hundred fifty-eight billion, one hundred sixty-eight million, four hundred fifty-three thousand, twenty".