209952427725 has 72 divisors (see below), whose sum is σ = 396840419040. Its totient is φ = 105813164160.

The previous prime is 209952427717. The next prime is 209952427747. The reversal of 209952427725 is 527724259902.

209952427725 is a `hidden beast` number, since 2 + 0 + 99 + 524 + 2 + 7 + 7 + 25 = 666.

209952427725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 209952427725 - 2³ = 209952427717 is a prime.

It is a Curzon number.

It is a congruent 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 71 ways as a sum of consecutive naturals, for example, 1635322 + ... + 1759028.

Almost surely, 2^209952427725 is an apocalyptic number.

209952427725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

209952427725 is a deficient number, since it is larger than the sum of its proper divisors (186887991315).

209952427725 is a wasteful number, since it uses less digits than its factorization.

209952427725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124139 (or 124131 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 209952427725 in words is "two hundred nine billion, nine hundred fifty-two million, four hundred twenty-seven thousand, seven hundred twenty-five".