866763361884366 has 224 divisors, whose sum is σ = 1982188073848320. Its totient is φ = 284091877368000.

The previous prime is 866763361884359. The next prime is 866763361884377. The reversal of 866763361884366 is 663488163367668.

866763361884366 is a `hidden beast` number, since 8 + 6 + 6 + 7 + 6 + 336 + 188 + 43 + 66 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is an unprimeable number.

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 111 ways as a sum of consecutive naturals, for example, 58482103236 + ... + 58482118056.

Almost surely, 2^{866763361884366} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866763361884366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991094036924160).

866763361884366 is an abundant number, since it is smaller than the sum of its proper divisors (1115424711963954).

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

866763361884366 is a wasteful number, since it uses less digits than its factorization.

866763361884366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17674 (or 17659 counting only the distinct ones).

The product of its digits is 18059231232, while the sum is 81.

The spelling of 866763361884366 in words is "eight hundred sixty-six trillion, seven hundred sixty-three billion, three hundred sixty-one million, eight hundred eighty-four thousand, three hundred sixty-six".