204217115406 has 64 divisors (see below), whose sum is σ = 422054696448. Its totient is φ = 65836487808.

The previous prime is 204217115393. The next prime is 204217115411. The reversal of 204217115406 is 604511712402.

204217115406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11859655 + ... + 11876861.

It is an arithmetic number, because the mean of its divisors is an integer number (6594604632).

Almost surely, 2^204217115406 is an apocalyptic number.

204217115406 is an abundant number, since it is smaller than the sum of its proper divisors (217837581042).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204217115406 is a wasteful number, since it uses less digits than its factorization.

204217115406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17705.

The product of its (nonzero) digits is 13440, while the sum is 33.

Adding to 204217115406 its reverse (604511712402), we get a palindrome (808728827808).

The spelling of 204217115406 in words is "two hundred four billion, two hundred seventeen million, one hundred fifteen thousand, four hundred six".