197255390869 has 4 divisors (see below), whose sum is σ = 197292635244. Its totient is φ = 197218146496.

The previous prime is 197255390861. The next prime is 197255390873. The reversal of 197255390869 is 968093552791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968093552791 = 397 ⋅2438522803.

It can be written as a sum of positive squares in 2 ways, for example, as 171261890244 + 25993500625 = 413838^2 + 161225^2 .

It is a cyclic number.

It is not a de Polignac number, because 197255390869 - 2³ = 197255390861 is a prime.

It is a super-2 number, since 2×197255390869² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197255390869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197255390861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18614242 + ... + 18624835.

It is an arithmetic number, because the mean of its divisors is an integer number (49323158811).

Almost surely, 2^197255390869 is an apocalyptic number.

It is an amenable number.

197255390869 is a deficient number, since it is larger than the sum of its proper divisors (37244375).

197255390869 is an equidigital number, since it uses as much as digits as its factorization.

197255390869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37244374.

The product of its (nonzero) digits is 36741600, while the sum is 64.

The spelling of 197255390869 in words is "one hundred ninety-seven billion, two hundred fifty-five million, three hundred ninety thousand, eight hundred sixty-nine".