205553544240 has 80 divisors (see below), whose sum is σ = 695144722176. Its totient is φ = 49831161600.

The previous prime is 205553544187. The next prime is 205553544247. The reversal of 205553544240 is 42445355502.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (205553544247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38927956 + ... + 38933235.

Almost surely, 2^205553544240 is an apocalyptic number.

205553544240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

205553544240 is an abundant number, since it is smaller than the sum of its proper divisors (489591177936).

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

205553544240 is a wasteful number, since it uses less digits than its factorization.

205553544240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77861218 (or 77861212 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 39.

Adding to 205553544240 its reverse (42445355502), we get a palindrome (247998899742).

The spelling of 205553544240 in words is "two hundred five billion, five hundred fifty-three million, five hundred forty-four thousand, two hundred forty".