86600199978 has 192 divisors, whose sum is σ = 218637619200. Its totient is φ = 25309674720.

The previous prime is 86600199937. The next prime is 86600200003. The reversal of 86600199978 is 87999100668.

86600199978 is a `hidden beast` number, since 8 + 6 + 600 + 19 + 9 + 9 + 7 + 8 = 666.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 16822801 + ... + 16827947.

It is an arithmetic number, because the mean of its divisors is an integer number (1138737600).

Almost surely, 2^86600199978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86600199978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109318809600).

86600199978 is an abundant number, since it is smaller than the sum of its proper divisors (132037419222).

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

86600199978 is a wasteful number, since it uses less digits than its factorization.

86600199978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5254 (or 5225 counting only the distinct ones).

The product of its (nonzero) digits is 11757312, while the sum is 63.

The spelling of 86600199978 in words is "eighty-six billion, six hundred million, one hundred ninety-nine thousand, nine hundred seventy-eight".