195236986897 has 24 divisors (see below), whose sum is σ = 214454533176. Its totient is φ = 177118792704.

The previous prime is 195236986871. The next prime is 195236986921. The reversal of 195236986897 is 798689632591.

It can be written as a sum of positive squares in 12 ways, for example, as 29782475776 + 165454511121 = 172576^2 + 406761^2 .

It is not a de Polignac number, because 195236986897 - 2³¹ = 193089503249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195236981897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8752923 + ... + 8775199.

It is an arithmetic number, because the mean of its divisors is an integer number (8935605549).

Almost surely, 2^195236986897 is an apocalyptic number.

195236986897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

195236986897 is a deficient number, since it is larger than the sum of its proper divisors (19217546279).

195236986897 is a wasteful number, since it uses less digits than its factorization.

195236986897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22965 (or 22936 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 73.

The spelling of 195236986897 in words is "one hundred ninety-five billion, two hundred thirty-six million, nine hundred eighty-six thousand, eight hundred ninety-seven".