866831255620000 has 960 divisors, whose sum is σ = 2507982527191680. Its totient is φ = 291294003200000.

The previous prime is 866831255619991. The next prime is 866831255620003. The reversal of 866831255620000 is 26552138668.

It is a self number, because there is not a number n which added to its sum of digits gives 866831255620000.

It is not an unprimeable number, because it can be changed into a prime (866831255620003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 242064018210 + ... + 242064021790.

It is an arithmetic number, because the mean of its divisors is an integer number (2612481799158).

Almost surely, 2^{866831255620000} is an apocalyptic number.

866831255620000 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 866831255620000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253991263595840).

866831255620000 is an abundant number, since it is smaller than the sum of its proper divisors (1641151271571680).

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

866831255620000 is a wasteful number, since it uses less digits than its factorization.

866831255620000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4795 (or 4772 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 52.

The spelling of 866831255620000 in words is "eight hundred sixty-six trillion, eight hundred thirty-one billion, two hundred fifty-five million, six hundred twenty thousand".