123344543257 has 4 divisors (see below), whose sum is σ = 132832585060. Its totient is φ = 113856501456.

The previous prime is 123344543251. The next prime is 123344543263. The reversal of 123344543257 is 752345443321.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (123344543251) and next prime (123344543263).

It can be written as a sum of positive squares in 2 ways, for example, as 43076587401 + 80267955856 = 207549^2 + 283316^2 .

It is a cyclic number.

It is not a de Polignac number, because 123344543257 - 2¹¹ = 123344541209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123344543251) 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, 4744020882 + ... + 4744020907.

It is an arithmetic number, because the mean of its divisors is an integer number (33208146265).

Almost surely, 2^123344543257 is an apocalyptic number.

It is an amenable number.

123344543257 is a deficient number, since it is larger than the sum of its proper divisors (9488041803).

123344543257 is an equidigital number, since it uses as much as digits as its factorization.

123344543257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9488041802.

The product of its digits is 1209600, while the sum is 43.

Adding to 123344543257 its reverse (752345443321), we get a palindrome (875689986578).

The spelling of 123344543257 in words is "one hundred twenty-three billion, three hundred forty-four million, five hundred forty-three thousand, two hundred fifty-seven".