197723118258 has 64 divisors (see below), whose sum is σ = 443585577600. Its totient is φ = 65278042560.

The previous prime is 197723118227. The next prime is 197723118259. The reversal of 197723118258 is 852811327791.

197723118258 is a `hidden beast` number, since 1 + 9 + 7 + 72 + 311 + 8 + 258 = 666.

197723118258 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not an unprimeable number, because it can be changed into a prime (197723118259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21438088 + ... + 21447308.

It is an arithmetic number, because the mean of its divisors is an integer number (6931024650).

Almost surely, 2^197723118258 is an apocalyptic number.

197723118258 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 197723118258, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221792788800).

197723118258 is an abundant number, since it is smaller than the sum of its proper divisors (245862459342).

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

197723118258 is a wasteful number, since it uses less digits than its factorization.

197723118258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12984 (or 12978 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The spelling of 197723118258 in words is "one hundred ninety-seven billion, seven hundred twenty-three million, one hundred eighteen thousand, two hundred fifty-eight".