194889665194 has 24 divisors (see below), whose sum is σ = 340119182628. Its totient is φ = 83510239680.

The previous prime is 194889665189. The next prime is 194889665197. The reversal of 194889665194 is 491566988491.

It can be written as a sum of positive squares in 2 ways, for example, as 187961267025 + 6928398169 = 433545^2 + 83237^2 .

It is not an unprimeable number, because it can be changed into a prime (194889665197) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 437412 + ... + 762304.

Almost surely, 2^194889665194 is an apocalyptic number.

194889665194 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

194889665194 is a deficient number, since it is larger than the sum of its proper divisors (145229517434).

194889665194 is a wasteful number, since it uses less digits than its factorization.

194889665194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331030 (or 331023 counting only the distinct ones).

The product of its digits is 134369280, while the sum is 70.

The spelling of 194889665194 in words is "one hundred ninety-four billion, eight hundred eighty-nine million, six hundred sixty-five thousand, one hundred ninety-four".