194837785866 has 12 divisors (see below), whose sum is σ = 422148536082. Its totient is φ = 64945928616.

The previous prime is 194837785861. The next prime is 194837785921. The reversal of 194837785866 is 668587738491.

194837785866 is a `hidden beast` number, since 1 + 9 + 4 + 8 + 37 + 7 + 8 + 586 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 190833554025 + 4004231841 = 436845^2 + 63279^2 .

It is a junction number, because it is equal to n+sod(n) for n = 194837785794 and 194837785803.

It is not an unprimeable number, because it can be changed into a prime (194837785861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5412160701 + ... + 5412160736.

Almost surely, 2^194837785866 is an apocalyptic number.

194837785866 is an abundant number, since it is smaller than the sum of its proper divisors (227310750216).

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

194837785866 is a wasteful number, since it uses less digits than its factorization.

194837785866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10824321445 (or 10824321442 counting only the distinct ones).

The product of its digits is 487710720, while the sum is 72.

The spelling of 194837785866 in words is "one hundred ninety-four billion, eight hundred thirty-seven million, seven hundred eighty-five thousand, eight hundred sixty-six".