204291235645 has 32 divisors (see below), whose sum is σ = 286389301248. Its totient is φ = 136981551168.

The previous prime is 204291235613. The next prime is 204291235649. The reversal of 204291235645 is 546532192402.

It is not a de Polignac number, because 204291235645 - 2⁵ = 204291235613 is a prime.

It is a super-2 number, since 2×204291235645² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204291235649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1792042 + ... + 1902628.

It is an arithmetic number, because the mean of its divisors is an integer number (8949665664).

Almost surely, 2^204291235645 is an apocalyptic number.

It is an amenable number.

204291235645 is a deficient number, since it is larger than the sum of its proper divisors (82098065603).

204291235645 is a wasteful number, since it uses less digits than its factorization.

204291235645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111769.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 204291235645 in words is "two hundred four billion, two hundred ninety-one million, two hundred thirty-five thousand, six hundred forty-five".