866503086624 has 192 divisors, whose sum is σ = 2889078554880. Its totient is φ = 247509319680.

The previous prime is 866503086611. The next prime is 866503086653. The reversal of 866503086624 is 426680305668.

It is a happy number.

866503086624 is a `hidden beast` number, since 8 + 6 + 6 + 5 + 0 + 3 + 0 + 8 + 6 + 624 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27085102 + ... + 27117074.

It is an arithmetic number, because the mean of its divisors is an integer number (15047284140).

Almost surely, 2^866503086624 is an apocalyptic number.

866503086624 is a gapful number since it is divisible by the number (84) 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 866503086624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1444539277440).

866503086624 is an abundant number, since it is smaller than the sum of its proper divisors (2022575468256).

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

866503086624 is a wasteful number, since it uses less digits than its factorization.

866503086624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36480 (or 36466 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 54.

The spelling of 866503086624 in words is "eight hundred sixty-six billion, five hundred three million, eighty-six thousand, six hundred twenty-four".