205543523434 has 4 divisors (see below), whose sum is σ = 308315285154. Its totient is φ = 102771761716.

The previous prime is 205543523407. The next prime is 205543523473. The reversal of 205543523434 is 434325345502.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 205286017225 + 257506209 = 453085^2 + 16047^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51385880857 + ... + 51385880860.

Almost surely, 2^205543523434 is an apocalyptic number.

205543523434 is a deficient number, since it is larger than the sum of its proper divisors (102771761720).

205543523434 is a wasteful number, since it uses less digits than its factorization.

205543523434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102771761719.

The product of its (nonzero) digits is 864000, while the sum is 40.

Adding to 205543523434 its reverse (434325345502), we get a palindrome (639868868936).

The spelling of 205543523434 in words is "two hundred five billion, five hundred forty-three million, five hundred twenty-three thousand, four hundred thirty-four".