205625545563505 has 8 divisors (see below), whose sum is σ = 261265399069032. Its totient is φ = 154823940188928.

The previous prime is 205625545563497. The next prime is 205625545563517. The reversal of 205625545563505 is 505365545526502.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6219402540129 + 199406143023376 = 2493873^2 + 14121124^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205625545563505 - 2³ = 205625545563497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 205625545563505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1209562032642 + ... + 1209562032811.

It is an arithmetic number, because the mean of its divisors is an integer number (32658174883629).

Almost surely, 2^{205625545563505} is an apocalyptic number.

It is an amenable number.

205625545563505 is a deficient number, since it is larger than the sum of its proper divisors (55639853505527).

205625545563505 is a wasteful number, since it uses less digits than its factorization.

205625545563505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419124065475.

The product of its (nonzero) digits is 135000000, while the sum is 58.

The spelling of 205625545563505 in words is "two hundred five trillion, six hundred twenty-five billion, five hundred forty-five million, five hundred sixty-three thousand, five hundred five".