866788570874688 has 336 divisors, whose sum is σ = 2937534525817344. Its totient is φ = 223035774581760.

The previous prime is 866788570874651. The next prime is 866788570874771. The reversal of 866788570874688 is 886478075887668.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (96).

It is a junction number, because it is equal to n+sod(n) for n = 866788570874595 and 866788570874604.

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, 28065756 + ... + 50212187.

Almost surely, 2^{866788570874688} is an apocalyptic number.

866788570874688 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

866788570874688 is an abundant number, since it is smaller than the sum of its proper divisors (2070745954942656).

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

866788570874688 is a wasteful number, since it uses less digits than its factorization.

866788570874688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78278090 (or 78278073 counting only the distinct ones).

The product of its (nonzero) digits is 388434493440, while the sum is 96.

The spelling of 866788570874688 in words is "eight hundred sixty-six trillion, seven hundred eighty-eight billion, five hundred seventy million, eight hundred seventy-four thousand, six hundred eighty-eight".