204445434557 has 32 divisors (see below), whose sum is σ = 252305625600. Its totient is φ = 161322220800.

The previous prime is 204445434541. The next prime is 204445434577. The reversal of 204445434557 is 755434544402.

It is not a de Polignac number, because 204445434557 - 2⁴ = 204445434541 is a prime.

It is a super-2 number, since 2×204445434557² (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 (204445434577) 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, 103620623 + ... + 103622595.

It is an arithmetic number, because the mean of its divisors is an integer number (7884550800).

Almost surely, 2^204445434557 is an apocalyptic number.

It is an amenable number.

204445434557 is a deficient number, since it is larger than the sum of its proper divisors (47860191043).

204445434557 is a wasteful number, since it uses less digits than its factorization.

204445434557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493.

The product of its (nonzero) digits is 5376000, while the sum is 47.

Adding to 204445434557 its reverse (755434544402), we get a palindrome (959879978959).

The spelling of 204445434557 in words is "two hundred four billion, four hundred forty-five million, four hundred thirty-four thousand, five hundred fifty-seven".