23145122405 has 4 divisors (see below), whose sum is σ = 27774146892. Its totient is φ = 18516097920.

The previous prime is 23145122347. The next prime is 23145122431. The reversal of 23145122405 is 50422154132.

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 8420998756 + 14724123649 = 91766^2 + 121343^2 .

It is not a de Polignac number, because 23145122405 - 2⁸ = 23145122149 is a prime.

It is a super-2 number, since 2×23145122405² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 2314512236 + ... + 2314512245.

It is an arithmetic number, because the mean of its divisors is an integer number (6943536723).

Almost surely, 2^23145122405 is an apocalyptic number.

It is an amenable number.

23145122405 is a deficient number, since it is larger than the sum of its proper divisors (4629024487).

23145122405 is an equidigital number, since it uses as much as digits as its factorization.

23145122405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629024486.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 23145122405 its reverse (50422154132), we get a palindrome (73567276537).

The spelling of 23145122405 in words is "twenty-three billion, one hundred forty-five million, one hundred twenty-two thousand, four hundred five".