866243580532800 has 84 divisors (see below), whose sum is σ = 2842000813813776. Its totient is φ = 230998288140800.

The previous prime is 866243580532777. The next prime is 866243580532831. The reversal of 866243580532800 is 8235085342668.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90233701506 + ... + 90233711105.

Almost surely, 2^{866243580532800} is an apocalyptic number.

866243580532800 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

866243580532800 is an abundant number, since it is smaller than the sum of its proper divisors (1975757233280976).

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

866243580532800 is a wasteful number, since it uses less digits than its factorization.

866243580532800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180467412636 (or 180467412621 counting only the distinct ones).

The product of its (nonzero) digits is 66355200, while the sum is 60.

The spelling of 866243580532800 in words is "eight hundred sixty-six trillion, two hundred forty-three billion, five hundred eighty million, five hundred thirty-two thousand, eight hundred".