205115355545045 has 12 divisors (see below), whose sum is σ = 270548849132940. Its totient is φ = 149174804032320.

The previous prime is 205115355545041. The next prime is 205115355545083. The reversal of 205115355545045 is 540545553511502.

It can be written as a sum of positive squares in 2 ways, for example, as 107089237682449 + 98026117862596 = 10348393^2 + 9900814^2 .

It is not a de Polignac number, because 205115355545045 - 2² = 205115355545041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 205115355544984 and 205115355545002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205115355545041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169516822160 + ... + 169516823369.

It is an arithmetic number, because the mean of its divisors is an integer number (22545737427745).

Almost surely, 2^{205115355545045} is an apocalyptic number.

It is an amenable number.

205115355545045 is a deficient number, since it is larger than the sum of its proper divisors (65433493587895).

205115355545045 is a wasteful number, since it uses less digits than its factorization.

205115355545045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339033645556 (or 339033645545 counting only the distinct ones).

The product of its (nonzero) digits is 7500000, while the sum is 50.

The spelling of 205115355545045 in words is "two hundred five trillion, one hundred fifteen billion, three hundred fifty-five million, five hundred forty-five thousand, forty-five".