205440133454 has 4 divisors (see below), whose sum is σ = 308160200184. Its totient is φ = 102720066726.

The previous prime is 205440133421. The next prime is 205440133469. The reversal of 205440133454 is 454331044502.

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

It is a congruent 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 as a sum of consecutive naturals, namely, 51360033362 + ... + 51360033365.

It is an arithmetic number, because the mean of its divisors is an integer number (77040050046).

Almost surely, 2^205440133454 is an apocalyptic number.

205440133454 is a deficient number, since it is larger than the sum of its proper divisors (102720066730).

205440133454 is a wasteful number, since it uses less digits than its factorization.

205440133454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102720066729.

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 205440133454 its reverse (454331044502), we get a palindrome (659771177956).

The spelling of 205440133454 in words is "two hundred five billion, four hundred forty million, one hundred thirty-three thousand, four hundred fifty-four".