209643441725 has 12 divisors (see below), whose sum is σ = 259964908800. Its totient is φ = 167710210800.

The previous prime is 209643441659. The next prime is 209643441743. The reversal of 209643441725 is 527144346902.

It is a de Polignac number, because none of the positive numbers 2^k-209643441725 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 209643441725.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1069610 + ... + 1250340.

It is an arithmetic number, because the mean of its divisors is an integer number (21663742400).

Almost surely, 2^209643441725 is an apocalyptic number.

209643441725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

209643441725 is a deficient number, since it is larger than the sum of its proper divisors (50321467075).

209643441725 is a wasteful number, since it uses less digits than its factorization.

209643441725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227140 (or 227135 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 47.

The spelling of 209643441725 in words is "two hundred nine billion, six hundred forty-three million, four hundred forty-one thousand, seven hundred twenty-five".