263434105505 has 4 divisors (see below), whose sum is σ = 316120926612. Its totient is φ = 210747284400.

The previous prime is 263434105483. The next prime is 263434105547. The reversal of 263434105505 is 505501434362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505501434362 = 2 ⋅252750717181.

It can be written as a sum of positive squares in 2 ways, for example, as 109537169296 + 153896936209 = 330964^2 + 392297^2 .

It is not a de Polignac number, because 263434105505 - 2²⁴ = 263417328289 is a prime.

It is a Duffinian 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, 26343410546 + ... + 26343410555.

It is an arithmetic number, because the mean of its divisors is an integer number (79030231653).

Almost surely, 2^263434105505 is an apocalyptic number.

It is an amenable number.

263434105505 is a deficient number, since it is larger than the sum of its proper divisors (52686821107).

263434105505 is an equidigital number, since it uses as much as digits as its factorization.

263434105505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52686821106.

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 263434105505 its reverse (505501434362), we get a palindrome (768935539867).

The spelling of 263434105505 in words is "two hundred sixty-three billion, four hundred thirty-four million, one hundred five thousand, five hundred five".