195943449025 has 27 divisors (see below), whose sum is σ = 244680633801. Its totient is φ = 155658745440.

The previous prime is 195943449007. The next prime is 195943449067. The reversal of 195943449025 is 520944349591.

The square root of 195943449025 is 442655.

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

195943449025 is digitally balanced in base 2, 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 4 ways, for example, as 197374401 + 195746074624 = 14049^2 + 442432^2 .

It is a de Polignac number, because none of the positive numbers 2^k-195943449025 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 493560127 + ... + 493560523.

Almost surely, 2^195943449025 is an apocalyptic number.

195943449025 is the 442655-th square number.

195943449025 is the 221328-th centered octagonal number.

It is an amenable number.

195943449025 is a deficient number, since it is larger than the sum of its proper divisors (48737184776).

195943449025 is an frugal number, since it uses more digits than its factorization.

195943449025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 195943449025 in words is "one hundred ninety-five billion, nine hundred forty-three million, four hundred forty-nine thousand, twenty-five".