204133423551 has 16 divisors (see below), whose sum is σ = 273390458880. Its totient is φ = 135484017120.

The previous prime is 204133423547. The next prime is 204133423553. The reversal of 204133423551 is 155324331402.

It is not a de Polignac number, because 204133423551 - 2² = 204133423547 is a prime.

It is a super-2 number, since 2×204133423551² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204133423553) 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, 439026 + ... + 775248.

It is an arithmetic number, because the mean of its divisors is an integer number (17086903680).

Almost surely, 2^204133423551 is an apocalyptic number.

204133423551 is a deficient number, since it is larger than the sum of its proper divisors (69257035329).

204133423551 is a wasteful number, since it uses less digits than its factorization.

204133423551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337126.

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 204133423551 its reverse (155324331402), we get a palindrome (359457754953).

The spelling of 204133423551 in words is "two hundred four billion, one hundred thirty-three million, four hundred twenty-three thousand, five hundred fifty-one".