205054640455 has 16 divisors (see below), whose sum is σ = 282690146304. Its totient is φ = 139872719520.

The previous prime is 205054640431. The next prime is 205054640491. The reversal of 205054640455 is 554046450502.

It is a happy number.

It is not a de Polignac number, because 205054640455 - 2¹¹ = 205054638407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15330237 + ... + 15343606.

It is an arithmetic number, because the mean of its divisors is an integer number (17668134144).

Almost surely, 2^205054640455 is an apocalyptic number.

205054640455 is a deficient number, since it is larger than the sum of its proper divisors (77635505849).

205054640455 is a wasteful number, since it uses less digits than its factorization.

205054640455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30674046.

The product of its (nonzero) digits is 480000, while the sum is 40.

The spelling of 205054640455 in words is "two hundred five billion, fifty-four million, six hundred forty thousand, four hundred fifty-five".