195897981278736 has 135 divisors (see below), whose sum is σ = 602619084289677. Its totient is φ = 59362464775680.

The previous prime is 195897981278669. The next prime is 195897981278737. The reversal of 195897981278736 is 637872189798591.

The square root of 195897981278736 is 13996356.

It is a perfect power (a square), and thus also a powerful number.

195897981278736 is a `hidden beast` number, since 1 + 9 + 589 + 7 + 9 + 8 + 12 + 7 + 8 + 7 + 3 + 6 = 666.

195897981278736 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 18183913347600 + 177714067931136 = 4264260^2 + 13330944^2 .

It is not an unprimeable number, because it can be changed into a prime (195897981278737) 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 26 ways as a sum of consecutive naturals, for example, 1847465976 + ... + 1847572008.

Almost surely, 2^{195897981278736} is an apocalyptic number.

195897981278736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

195897981278736 is the 13996356-th square number.

It is an amenable number.

195897981278736 is an abundant number, since it is smaller than the sum of its proper divisors (406721103010941).

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

195897981278736 is an frugal number, since it uses more digits than its factorization.

195897981278736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212102 (or 106049 counting only the distinct ones).

The product of its digits is 23044331520, while the sum is 90.

The spelling of 195897981278736 in words is "one hundred ninety-five trillion, eight hundred ninety-seven billion, nine hundred eighty-one million, two hundred seventy-eight thousand, seven hundred thirty-six".