123871718753 has 4 divisors (see below), whose sum is σ = 126892980228. Its totient is φ = 120850457280.

The previous prime is 123871718689. The next prime is 123871718779. The reversal of 123871718753 is 357817178321.

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 15477350464 + 108394368289 = 124408^2 + 329233^2 .

It is a cyclic number.

It is not a de Polignac number, because 123871718753 - 2⁶ = 123871718689 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 123871718695 and 123871718704.

It is not an unprimeable number, because it can be changed into a prime (123871718053) 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, 1510630676 + ... + 1510630757.

It is an arithmetic number, because the mean of its divisors is an integer number (31723245057).

Almost surely, 2^123871718753 is an apocalyptic number.

It is an amenable number.

123871718753 is a deficient number, since it is larger than the sum of its proper divisors (3021261475).

123871718753 is an equidigital number, since it uses as much as digits as its factorization.

123871718753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3021261474.

The product of its digits is 1975680, while the sum is 53.

The spelling of 123871718753 in words is "one hundred twenty-three billion, eight hundred seventy-one million, seven hundred eighteen thousand, seven hundred fifty-three".