866640960000 has 1200 divisors, whose sum is σ = 3422067187968. Its totient is φ = 210124800000.

The previous prime is 866640959999. The next prime is 866640960083. The reversal of 866640960000 is 69046668.

It is a tau number, because it is divible by the number of its divisors (1200).

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

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1517759715 + ... + 1517760285.

Almost surely, 2^866640960000 is an apocalyptic number.

866640960000 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 866640960000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711033593984).

866640960000 is an abundant number, since it is smaller than the sum of its proper divisors (2555426227968).

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

866640960000 is a wasteful number, since it uses less digits than its factorization.

866640960000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 866640960000 in words is "eight hundred sixty-six billion, six hundred forty million, nine hundred sixty thousand".