866786026508688 has 320 divisors, whose sum is σ = 2670439932905472. Its totient is φ = 238793148887040.

The previous prime is 866786026508657. The next prime is 866786026508713. The reversal of 866786026508688 is 886805620687668.

It is a self number, because there is not a number n which added to its sum of digits gives 866786026508688.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2438608356 + ... + 2438963772.

Almost surely, 2^{866786026508688} is an apocalyptic number.

866786026508688 is a gapful number since it is divisible by the number (88) 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 866786026508688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1335219966452736).

866786026508688 is an abundant number, since it is smaller than the sum of its proper divisors (1803653906396784).

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

866786026508688 is a wasteful number, since it uses less digits than its factorization.

866786026508688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360822 (or 360816 counting only the distinct ones).

The product of its (nonzero) digits is 17836277760, while the sum is 84.

The spelling of 866786026508688 in words is "eight hundred sixty-six trillion, seven hundred eighty-six billion, twenty-six million, five hundred eight thousand, six hundred eighty-eight".