866182134835820 has 192 divisors, whose sum is σ = 2113866803607552. Its totient is φ = 294642968064000.

The previous prime is 866182134835817. The next prime is 866182134835879. The reversal of 866182134835820 is 28538431281668.

It is a happy number.

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, 2116197785 + ... + 2116607055.

It is an arithmetic number, because the mean of its divisors is an integer number (11009722935456).

Almost surely, 2^{866182134835820} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866182134835820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1056933401803776).

866182134835820 is an abundant number, since it is smaller than the sum of its proper divisors (1247684668771732).

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

866182134835820 is a wasteful number, since it uses less digits than its factorization.

866182134835820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412752 (or 412750 counting only the distinct ones).

The product of its (nonzero) digits is 106168320, while the sum is 65.

The spelling of 866182134835820 in words is "eight hundred sixty-six trillion, one hundred eighty-two billion, one hundred thirty-four million, eight hundred thirty-five thousand, eight hundred twenty".