205143255251 has 8 divisors (see below), whose sum is σ = 224302425600. Its totient is φ = 186069048840.

The previous prime is 205143255203. The next prime is 205143255259. The reversal of 205143255251 is 152552341502.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205143255251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (205143255259) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 21235931 + ... + 21245588.

It is an arithmetic number, because the mean of its divisors is an integer number (28037803200).

Almost surely, 2^205143255251 is an apocalyptic number.

205143255251 is a deficient number, since it is larger than the sum of its proper divisors (19159170349).

205143255251 is a wasteful number, since it uses less digits than its factorization.

205143255251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42481969.

The product of its (nonzero) digits is 60000, while the sum is 35.

Adding to 205143255251 its reverse (152552341502), we get a palindrome (357695596753).

The spelling of 205143255251 in words is "two hundred five billion, one hundred forty-three million, two hundred fifty-five thousand, two hundred fifty-one".