204355103405 has 4 divisors (see below), whose sum is σ = 245226124092. Its totient is φ = 163484082720.

The previous prime is 204355103347. The next prime is 204355103417. The reversal of 204355103405 is 504301553402.

It is a happy number.

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 149742685156 + 54612418249 = 386966^2 + 233693^2 .

It is not a de Polignac number, because 204355103405 - 2⁸ = 204355103149 is a prime.

It is a super-2 number, since 2×204355103405² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20435510336 + ... + 20435510345.

It is an arithmetic number, because the mean of its divisors is an integer number (61306531023).

Almost surely, 2^204355103405 is an apocalyptic number.

It is an amenable number.

204355103405 is a deficient number, since it is larger than the sum of its proper divisors (40871020687).

204355103405 is an equidigital number, since it uses as much as digits as its factorization.

204355103405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40871020686.

The product of its (nonzero) digits is 36000, while the sum is 32.

Adding to 204355103405 its reverse (504301553402), we get a palindrome (708656656807).

The spelling of 204355103405 in words is "two hundred four billion, three hundred fifty-five million, one hundred three thousand, four hundred five".