195509887225 has 27 divisors (see below), whose sum is σ = 244235688879. Its totient is φ = 155252974800.

The previous prime is 195509887211. The next prime is 195509887249. The reversal of 195509887225 is 522788905591.

The square root of 195509887225 is 442165.

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

It can be written as a sum of positive squares in only one way, i.e., 70383559401 + 125126327824 = 265299^2 + 353732^2 .

It is not a de Polignac number, because 195509887225 - 2⁹ = 195509886713 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 (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 422267344 + ... + 422267806.

Almost surely, 2^195509887225 is an apocalyptic number.

195509887225 is the 442165-th square number.

195509887225 is the 221083-rd centered octagonal number.

It is an amenable number.

195509887225 is a deficient number, since it is larger than the sum of its proper divisors (48725801654).

195509887225 is an frugal number, since it uses more digits than its factorization.

195509887225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318 (or 659 counting only the distinct ones).

The product of its (nonzero) digits is 18144000, while the sum is 61.

The spelling of 195509887225 in words is "one hundred ninety-five billion, five hundred nine million, eight hundred eighty-seven thousand, two hundred twenty-five".