204631634881 has 4 divisors (see below), whose sum is σ = 216668789892. Its totient is φ = 192594479872.

The previous prime is 204631634843. The next prime is 204631634903. The reversal of 204631634881 is 188436136402.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 164304569025 + 40327065856 = 405345^2 + 200816^2 .

It is a cyclic number.

It is not a de Polignac number, because 204631634881 - 2¹¹ = 204631632833 is a prime.

It is a super-2 number, since 2×204631634881² (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 (204631334881) 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, 6018577480 + ... + 6018577513.

It is an arithmetic number, because the mean of its divisors is an integer number (54167197473).

Almost surely, 2^204631634881 is an apocalyptic number.

It is an amenable number.

204631634881 is a deficient number, since it is larger than the sum of its proper divisors (12037155011).

204631634881 is a wasteful number, since it uses less digits than its factorization.

204631634881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12037155010.

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 204631634881 in words is "two hundred four billion, six hundred thirty-one million, six hundred thirty-four thousand, eight hundred eighty-one".