197171668 has 24 divisors (see below), whose sum is σ = 358381800. Its totient is φ = 94837248.

The previous prime is 197171659. The next prime is 197171669. The reversal of 197171668 is 866171791.

It can be written as a sum of positive squares in 4 ways, for example, as 1227664 + 195944004 = 1108^2 + 13998^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197171669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5688 + ... + 20656.

It is an arithmetic number, because the mean of its divisors is an integer number (14932575).

Almost surely, 2^197171668 is an apocalyptic number.

It is an amenable number.

197171668 is a deficient number, since it is larger than the sum of its proper divisors (161210132).

197171668 is a wasteful number, since it uses less digits than its factorization.

197171668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15099 (or 15097 counting only the distinct ones).

The product of its digits is 127008, while the sum is 46.

The square root of 197171668 is about 14041.7829352259. The cubic root of 197171668 is about 582.0337521708.

The spelling of 197171668 in words is "one hundred ninety-seven million, one hundred seventy-one thousand, six hundred sixty-eight".