866240664960 has 384 divisors, whose sum is σ = 3058249582080. Its totient is φ = 208387379200.

The previous prime is 866240664959. The next prime is 866240664973. The reversal of 866240664960 is 69466042668.

It is a tau number, because it is divible by the number of its divisors (384).

It is a self number, because there is not a number n which added to its sum of digits gives 866240664960.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30419689 + ... + 30448151.

It is an arithmetic number, because the mean of its divisors is an integer number (7964191620).

Almost surely, 2^866240664960 is an apocalyptic number.

866240664960 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 866240664960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1529124791040).

866240664960 is an abundant number, since it is smaller than the sum of its proper divisors (2192008917120).

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

866240664960 is a wasteful number, since it uses less digits than its factorization.

866240664960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28638 (or 28615 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 57.

The spelling of 866240664960 in words is "eight hundred sixty-six billion, two hundred forty million, six hundred sixty-four thousand, nine hundred sixty".