123553355513 has 4 divisors (see below), whose sum is σ = 141203834880. Its totient is φ = 105902876148.

The previous prime is 123553355491. The next prime is 123553355539. The reversal of 123553355513 is 315553355321.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 315553355321 = 430949 ⋅732229.

It is a cyclic number.

It is not a de Polignac number, because 123553355513 - 2⁸ = 123553355257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123553355543) 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, 8825239673 + ... + 8825239686.

It is an arithmetic number, because the mean of its divisors is an integer number (35300958720).

Almost surely, 2^123553355513 is an apocalyptic number.

It is an amenable number.

123553355513 is a deficient number, since it is larger than the sum of its proper divisors (17650479367).

123553355513 is an equidigital number, since it uses as much as digits as its factorization.

123553355513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17650479366.

The product of its digits is 506250, while the sum is 41.

The spelling of 123553355513 in words is "one hundred twenty-three billion, five hundred fifty-three million, three hundred fifty-five thousand, five hundred thirteen".