195400378897 has 2 divisors, whose sum is σ = 195400378898. Its totient is φ = 195400378896.

The previous prime is 195400378889. The next prime is 195400378919. The reversal of 195400378897 is 798873004591.

195400378897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165043937536 + 30356441361 = 406256^2 + 174231^2 .

It is a cyclic number.

It is not a de Polignac number, because 195400378897 - 2³ = 195400378889 is a prime.

It is not a weakly prime, because it can be changed into another prime (195400378847) 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 as a sum of consecutive naturals, namely, 97700189448 + 97700189449.

It is an arithmetic number, because the mean of its divisors is an integer number (97700189449).

Almost surely, 2^195400378897 is an apocalyptic number.

It is an amenable number.

195400378897 is a deficient number, since it is larger than the sum of its proper divisors (1).

195400378897 is an equidigital number, since it uses as much as digits as its factorization.

195400378897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 61.

The spelling of 195400378897 in words is "one hundred ninety-five billion, four hundred million, three hundred seventy-eight thousand, eight hundred ninety-seven".