866333491200 has 864 divisors, whose sum is σ = 3407653693080. Its totient is φ = 217432719360.

The previous prime is 866333491193. The next prime is 866333491297. The reversal of 866333491200 is 2194333668.

866333491200 is a `hidden beast` number, since 8 + 6 + 633 + 3 + 4 + 9 + 1 + 2 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 50960793592 + ... + 50960793608.

Almost surely, 2^866333491200 is an apocalyptic number.

866333491200 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866333491200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1703826846540).

866333491200 is an abundant number, since it is smaller than the sum of its proper divisors (2541320201880).

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

866333491200 is an frugal number, since it uses more digits than its factorization.

866333491200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88 (or 27 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 45.

The spelling of 866333491200 in words is "eight hundred sixty-six billion, three hundred thirty-three million, four hundred ninety-one thousand, two hundred".