199189646678 has 16 divisors (see below), whose sum is σ = 325955543040. Its totient is φ = 90538290600.

The previous prime is 199189646671. The next prime is 199189646753. The reversal of 199189646678 is 876646981991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199189646671) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 892283 + ... + 1092953.

It is an arithmetic number, because the mean of its divisors is an integer number (20372221440).

Almost surely, 2^199189646678 is an apocalyptic number.

199189646678 is a deficient number, since it is larger than the sum of its proper divisors (126765896362).

199189646678 is a wasteful number, since it uses less digits than its factorization.

199189646678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245803.

The product of its digits is 282175488, while the sum is 74.

The spelling of 199189646678 in words is "one hundred ninety-nine billion, one hundred eighty-nine million, six hundred forty-six thousand, six hundred seventy-eight".