204365223513 has 24 divisors (see below), whose sum is σ = 324879890400. Its totient is φ = 122761618560.

The previous prime is 204365223497. The next prime is 204365223551. The reversal of 204365223513 is 315322563402.

204365223513 is a `hidden beast` number, since 20 + 4 + 365 + 223 + 51 + 3 = 666.

It is not a de Polignac number, because 204365223513 - 2⁴ = 204365223497 is a prime.

It is a super-2 number, since 2×204365223513² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (204365223583) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9122863 + ... + 9145236.

It is an arithmetic number, because the mean of its divisors is an integer number (13536662100).

Almost surely, 2^204365223513 is an apocalyptic number.

It is an amenable number.

204365223513 is a deficient number, since it is larger than the sum of its proper divisors (120514666887).

204365223513 is a wasteful number, since it uses less digits than its factorization.

204365223513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18268229 (or 18268226 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

Adding to 204365223513 its reverse (315322563402), we get a palindrome (519687786915).

The spelling of 204365223513 in words is "two hundred four billion, three hundred sixty-five million, two hundred twenty-three thousand, five hundred thirteen".