205561220052 has 24 divisors (see below), whose sum is σ = 486213298816. Its totient is φ = 67581770688.

The previous prime is 205561220047. The next prime is 205561220099. The reversal of 205561220052 is 250022165502.

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 in 7 ways as a sum of consecutive naturals, for example, 117328588 + ... + 117330339.

Almost surely, 2^205561220052 is an apocalyptic number.

It is an amenable number.

205561220052 is an abundant number, since it is smaller than the sum of its proper divisors (280652078764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205561220052 is a wasteful number, since it uses less digits than its factorization.

205561220052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234659007 (or 234659005 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 205561220052 its reverse (250022165502), we get a palindrome (455583385554).

The spelling of 205561220052 in words is "two hundred five billion, five hundred sixty-one million, two hundred twenty thousand, fifty-two".