123265206305 has 4 divisors (see below), whose sum is σ = 147918247572. Its totient is φ = 98612165040.

The previous prime is 123265206269. The next prime is 123265206343. The reversal of 123265206305 is 503602562321.

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 17827323361 + 105437882944 = 133519^2 + 324712^2 .

It is not a de Polignac number, because 123265206305 - 2⁶ = 123265206241 is a prime.

It is a super-2 number, since 2×123265206305² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12326520626 + ... + 12326520635.

It is an arithmetic number, because the mean of its divisors is an integer number (36979561893).

Almost surely, 2^123265206305 is an apocalyptic number.

It is an amenable number.

123265206305 is a deficient number, since it is larger than the sum of its proper divisors (24653041267).

123265206305 is an equidigital number, since it uses as much as digits as its factorization.

123265206305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24653041266.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 123265206305 its reverse (503602562321), we get a palindrome (626867768626).

The spelling of 123265206305 in words is "one hundred twenty-three billion, two hundred sixty-five million, two hundred six thousand, three hundred five".