204824225281 has 4 divisors (see below), whose sum is σ = 220579934932. Its totient is φ = 189068515632.

The previous prime is 204824225279. The next prime is 204824225317. The reversal of 204824225281 is 182522428402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 182522428402 = 2 ⋅91261214201.

It can be written as a sum of positive squares in 2 ways, for example, as 124156864881 + 80667360400 = 352359^2 + 284020^2 .

It is a cyclic number.

It is not a de Polignac number, because 204824225281 - 2¹ = 204824225279 is a prime.

It is a super-2 number, since 2×204824225281² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204824025281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7877854806 + ... + 7877854831.

It is an arithmetic number, because the mean of its divisors is an integer number (55144983733).

Almost surely, 2^204824225281 is an apocalyptic number.

It is an amenable number.

204824225281 is a deficient number, since it is larger than the sum of its proper divisors (15755709651).

204824225281 is a wasteful number, since it uses less digits than its factorization.

204824225281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15755709650.

The product of its (nonzero) digits is 163840, while the sum is 40.

The spelling of 204824225281 in words is "two hundred four billion, eight hundred twenty-four million, two hundred twenty-five thousand, two hundred eighty-one".