205434135455 has 8 divisors (see below), whose sum is σ = 247323964272. Its totient is φ = 163811973888.

The previous prime is 205434135449. The next prime is 205434135497. The reversal of 205434135455 is 554531434502.

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 205434135455 - 2¹⁴ = 205434119071 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 7 ways as a sum of consecutive naturals, for example, 66915122 + ... + 66918191.

It is an arithmetic number, because the mean of its divisors is an integer number (30915495534).

Almost surely, 2^205434135455 is an apocalyptic number.

205434135455 is a deficient number, since it is larger than the sum of its proper divisors (41889828817).

205434135455 is a wasteful number, since it uses less digits than its factorization.

205434135455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133833625.

The product of its (nonzero) digits is 720000, while the sum is 41.

Adding to 205434135455 its reverse (554531434502), we get a palindrome (759965569957).

The spelling of 205434135455 in words is "two hundred five billion, four hundred thirty-four million, one hundred thirty-five thousand, four hundred fifty-five".