205234350405 has 32 divisors (see below), whose sum is σ = 375380189184. Its totient is φ = 93797787456.

The previous prime is 205234350403. The next prime is 205234350407. The reversal of 205234350405 is 504053432502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (205234350403) and next prime (205234350407).

It is not a de Polignac number, because 205234350405 - 2¹ = 205234350403 is a prime.

It is a super-2 number, since 2×205234350405² (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 (205234350403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176172 + ... + 664458.

It is an arithmetic number, because the mean of its divisors is an integer number (11730630912).

Almost surely, 2^205234350405 is an apocalyptic number.

It is an amenable number.

205234350405 is a deficient number, since it is larger than the sum of its proper divisors (170145838779).

205234350405 is a wasteful number, since it uses less digits than its factorization.

205234350405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492305.

The product of its (nonzero) digits is 72000, while the sum is 33.

Adding to 205234350405 its reverse (504053432502), we get a palindrome (709287782907).

The spelling of 205234350405 in words is "two hundred five billion, two hundred thirty-four million, three hundred fifty thousand, four hundred five".