197918438025 has 144 divisors (see below), whose sum is σ = 422532384768. Its totient is φ = 79413600000.

The previous prime is 197918438021. The next prime is 197918438027. The reversal of 197918438025 is 520834819791.

197918438025 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 197918438025 - 2² = 197918438021 is a prime.

It is a super-2 number, since 2×197918438025² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

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 143 ways as a sum of consecutive naturals, for example, 4836400 + ... + 4877150.

It is an arithmetic number, because the mean of its divisors is an integer number (2934252672).

Almost surely, 2^197918438025 is an apocalyptic number.

197918438025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197918438025 is an abundant number, since it is smaller than the sum of its proper divisors (224613946743).

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

197918438025 is a wasteful number, since it uses less digits than its factorization.

197918438025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40840 (or 40806 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 197918438025 in words is "one hundred ninety-seven billion, nine hundred eighteen million, four hundred thirty-eight thousand, twenty-five".