197418221568 has 544 divisors, whose sum is σ = 624107673600. Its totient is φ = 61577625600.

The previous prime is 197418221519. The next prime is 197418221569. The reversal of 197418221568 is 865122814791.

197418221568 is a `hidden beast` number, since 1 + 9 + 7 + 418 + 2 + 215 + 6 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (1935360) is a multiple of the sum of its prime factors (192).

It is not an unprimeable number, because it can be changed into a prime (197418221569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3236364258 + ... + 3236364318.

Almost surely, 2^197418221568 is an apocalyptic number.

197418221568 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 197418221568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312053836800).

197418221568 is an abundant number, since it is smaller than the sum of its proper divisors (426689452032).

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

197418221568 is an frugal number, since it uses more digits than its factorization.

197418221568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192 (or 156 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 197418221568 in words is "one hundred ninety-seven billion, four hundred eighteen million, two hundred twenty-one thousand, five hundred sixty-eight".