123539742385 has 4 divisors (see below), whose sum is σ = 148247690868. Its totient is φ = 98831793904.

The previous prime is 123539742371. The next prime is 123539742413. The reversal of 123539742385 is 583247935321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 583247935321 = 593 ⋅983554697.

It can be written as a sum of positive squares in 2 ways, for example, as 60721337889 + 62818404496 = 246417^2 + 250636^2 .

It is a cyclic number.

It is not a de Polignac number, because 123539742385 - 2¹⁵ = 123539709617 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12353974234 + ... + 12353974243.

It is an arithmetic number, because the mean of its divisors is an integer number (37061922717).

Almost surely, 2^123539742385 is an apocalyptic number.

It is an amenable number.

123539742385 is a deficient number, since it is larger than the sum of its proper divisors (24707948483).

123539742385 is an equidigital number, since it uses as much as digits as its factorization.

123539742385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24707948482.

The product of its digits is 5443200, while the sum is 52.

The spelling of 123539742385 in words is "one hundred twenty-three billion, five hundred thirty-nine million, seven hundred forty-two thousand, three hundred eighty-five".