197191668 has 24 divisors (see below), whose sum is σ = 460640320. Its totient is φ = 65655360.

The previous prime is 197191613. The next prime is 197191697. The reversal of 197191668 is 866191791.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2088 + ... + 19968.

Almost surely, 2^197191668 is an apocalyptic number.

It is an amenable number.

197191668 is an abundant number, since it is smaller than the sum of its proper divisors (263448652).

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

197191668 is a wasteful number, since it uses less digits than its factorization.

197191668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18807 (or 18805 counting only the distinct ones).

The product of its digits is 163296, while the sum is 48.

The square root of 197191668 is about 14042.4950774426. The cubic root of 197191668 is about 582.0534309303.

It can be divided in two parts, 1971 and 91668, that added together give a palindrome (93639).

The spelling of 197191668 in words is "one hundred ninety-seven million, one hundred ninety-one thousand, six hundred sixty-eight".