197918438081 has 24 divisors (see below), whose sum is σ = 257087363904. Its totient is φ = 148352951520.

The previous prime is 197918438051. The next prime is 197918438117. The reversal of 197918438081 is 180834819791.

197918438081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 197918438081 - 2²² = 197914243777 is a prime.

It is a super-2 number, since 2×197918438081² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 197918438081.

It is not an unprimeable number, because it can be changed into a prime (197918438021) 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 23 ways as a sum of consecutive naturals, for example, 2979515 + ... + 3045216.

It is an arithmetic number, because the mean of its divisors is an integer number (10711973496).

Almost surely, 2^197918438081 is an apocalyptic number.

It is an amenable number.

197918438081 is a deficient number, since it is larger than the sum of its proper divisors (59168925823).

197918438081 is a wasteful number, since it uses less digits than its factorization.

197918438081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6024789 (or 6024770 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 59.

The spelling of 197918438081 in words is "one hundred ninety-seven billion, nine hundred eighteen million, four hundred thirty-eight thousand, eighty-one".