199785360681 has 16 divisors (see below), whose sum is σ = 296091342720. Its totient is φ = 133139376720.

The previous prime is 199785360679. The next prime is 199785360689. The reversal of 199785360681 is 186063587991.

199785360681 is a `hidden beast` number, since 1 + 9 + 97 + 8 + 536 + 0 + 6 + 8 + 1 = 666.

It is not a de Polignac number, because 199785360681 - 2¹ = 199785360679 is a prime.

It is a super-2 number, since 2×199785360681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (199785360689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1340805 + ... + 1482338.

It is an arithmetic number, because the mean of its divisors is an integer number (18505708920).

Almost surely, 2^199785360681 is an apocalyptic number.

It is an amenable number.

199785360681 is a deficient number, since it is larger than the sum of its proper divisors (96305982039).

199785360681 is a wasteful number, since it uses less digits than its factorization.

199785360681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2825773 (or 2825767 counting only the distinct ones).

The product of its (nonzero) digits is 19595520, while the sum is 63.

The spelling of 199785360681 in words is "one hundred ninety-nine billion, seven hundred eighty-five million, three hundred sixty thousand, six hundred eighty-one".