65543680225 has 9 divisors (see below), whose sum is σ = 81275750803. Its totient is φ = 52433920120.

The previous prime is 65543680199. The next prime is 65543680249. The reversal of 65543680225 is 52208634556.

The square root of 65543680225 is 256015.

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., 23595724881 + 41947955344 = 153609^2 + 204812^2 .

It is not a de Polignac number, because 65543680225 - 2⁵ = 65543680193 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 8 ways as a sum of consecutive naturals, for example, 1254474 + ... + 1305676.

Almost surely, 2^65543680225 is an apocalyptic number.

65543680225 is the 256015-th square number.

65543680225 is the 128008-th centered octagonal number.

It is an amenable number.

65543680225 is a deficient number, since it is larger than the sum of its proper divisors (15732070578).

65543680225 is an frugal number, since it uses more digits than its factorization.

65543680225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102416 (or 51208 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 65543680225 in words is "sixty-five billion, five hundred forty-three million, six hundred eighty thousand, two hundred twenty-five".