3205404340253 has 4 divisors (see below), whose sum is σ = 3217876730940. Its totient is φ = 3192931949568.

The previous prime is 3205404340249. The next prime is 3205404340289. The reversal of 3205404340253 is 3520434045023.

It is a happy number.

3205404340253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2230787190724 + 974617149529 = 1493582^2 + 987227^2 .

It is a cyclic number.

It is not a de Polignac number, because 3205404340253 - 2² = 3205404340249 is a prime.

It is a super-2 number, since 2×3205404340253² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3205404360253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6236194958 + ... + 6236195471.

It is an arithmetic number, because the mean of its divisors is an integer number (804469182735).

Almost surely, 2^{3205404340253} is an apocalyptic number.

It is an amenable number.

3205404340253 is a deficient number, since it is larger than the sum of its proper divisors (12472390687).

3205404340253 is a wasteful number, since it uses less digits than its factorization.

3205404340253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12472390686.

The product of its (nonzero) digits is 172800, while the sum is 35.

Adding to 3205404340253 its reverse (3520434045023), we get a palindrome (6725838385276).

The spelling of 3205404340253 in words is "three trillion, two hundred five billion, four hundred four million, three hundred forty thousand, two hundred fifty-three".