205511011216 has 40 divisors (see below), whose sum is σ = 456702981440. Its totient is φ = 87758169984.

The previous prime is 205511011213. The next prime is 205511011267. The reversal of 205511011216 is 612110115502.

It is not an unprimeable number, because it can be changed into a prime (205511011213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3281106 + ... + 3343153.

It is an arithmetic number, because the mean of its divisors is an integer number (11417574536).

Almost surely, 2^205511011216 is an apocalyptic number.

It is an amenable number.

205511011216 is an abundant number, since it is smaller than the sum of its proper divisors (251191970224).

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

205511011216 is a wasteful number, since it uses less digits than its factorization.

205511011216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6624551 (or 6624545 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 25.

Adding to 205511011216 its reverse (612110115502), we get a palindrome (817621126718).

The spelling of 205511011216 in words is "two hundred five billion, five hundred eleven million, eleven thousand, two hundred sixteen".