123513306257 has 4 divisors (see below), whose sum is σ = 134741788656. Its totient is φ = 112284823860.

The previous prime is 123513306233. The next prime is 123513306281. The reversal of 123513306257 is 752603315321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (123513306233) and next prime (123513306281).

It is not a de Polignac number, because 123513306257 - 2³⁴ = 106333437073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123513306257.

It is not an unprimeable number, because it can be changed into a prime (123512306257) 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, 5614241183 + ... + 5614241204.

It is an arithmetic number, because the mean of its divisors is an integer number (33685447164).

Almost surely, 2^123513306257 is an apocalyptic number.

It is an amenable number.

123513306257 is a deficient number, since it is larger than the sum of its proper divisors (11228482399).

123513306257 is a wasteful number, since it uses less digits than its factorization.

123513306257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11228482398.

The product of its (nonzero) digits is 113400, while the sum is 38.

The spelling of 123513306257 in words is "one hundred twenty-three billion, five hundred thirteen million, three hundred six thousand, two hundred fifty-seven".