205224145242505 has 32 divisors (see below), whose sum is σ = 248082187719168. Its totient is φ = 162974557267200.

The previous prime is 205224145242449. The next prime is 205224145242559. The reversal of 205224145242505 is 505242541422502.

It is not a de Polignac number, because 205224145242505 - 2²⁷ = 205224011024777 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 (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1269784150 + ... + 1269945760.

It is an arithmetic number, because the mean of its divisors is an integer number (7752568366224).

Almost surely, 2^{205224145242505} is an apocalyptic number.

It is an amenable number.

205224145242505 is a deficient number, since it is larger than the sum of its proper divisors (42858042476663).

205224145242505 is a wasteful number, since it uses less digits than its factorization.

205224145242505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164737.

The product of its (nonzero) digits is 1280000, while the sum is 43.

The spelling of 205224145242505 in words is "two hundred five trillion, two hundred twenty-four billion, one hundred forty-five million, two hundred forty-two thousand, five hundred five".