204553111191 has 24 divisors (see below), whose sum is σ = 322179411456. Its totient is φ = 114435303840.

The previous prime is 204553111187. The next prime is 204553111207. The reversal of 204553111191 is 191111355402.

It is not a de Polignac number, because 204553111191 - 2² = 204553111187 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204553111181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18333415 + ... + 18344568.

It is an arithmetic number, because the mean of its divisors is an integer number (13424142144).

Almost surely, 2^204553111191 is an apocalyptic number.

204553111191 is a deficient number, since it is larger than the sum of its proper divisors (117626300265).

204553111191 is a wasteful number, since it uses less digits than its factorization.

204553111191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36678023 (or 36678010 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 33.

Adding to 204553111191 its reverse (191111355402), we get a palindrome (395664466593).

The spelling of 204553111191 in words is "two hundred four billion, five hundred fifty-three million, one hundred eleven thousand, one hundred ninety-one".