187805956866 has 96 divisors (see below), whose sum is σ = 415432160640. Its totient is φ = 56557923840.

The previous prime is 187805956823. The next prime is 187805956867. The reversal of 187805956866 is 668659508781.

It is a self number, because there is not a number n which added to its sum of digits gives 187805956866.

It is not an unprimeable number, because it can be changed into a prime (187805956867) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 92105875 + ... + 92107913.

It is an arithmetic number, because the mean of its divisors is an integer number (4327418340).

Almost surely, 2^187805956866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 187805956866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207716080320).

187805956866 is an abundant number, since it is smaller than the sum of its proper divisors (227626203774).

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

187805956866 is a wasteful number, since it uses less digits than its factorization.

187805956866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2792 (or 2781 counting only the distinct ones).

The product of its (nonzero) digits is 174182400, while the sum is 69.

The spelling of 187805956866 in words is "one hundred eighty-seven billion, eight hundred five million, nine hundred fifty-six thousand, eight hundred sixty-six".