123243502221525 has 36 divisors (see below), whose sum is σ = 237029952034752. Its totient is φ = 56339886728160.

The previous prime is 123243502221523. The next prime is 123243502221559. The reversal of 123243502221525 is 525122205342321.

It is not a de Polignac number, because 123243502221525 - 2¹ = 123243502221523 is a prime.

It is a super-2 number, since 2×123243502221525² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123243502221523) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16767819757 + ... + 16767827106.

Almost surely, 2^{123243502221525} is an apocalyptic number.

123243502221525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

123243502221525 is a deficient number, since it is larger than the sum of its proper divisors (113786449813227).

123243502221525 is a wasteful number, since it uses less digits than its factorization.

123243502221525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33535646890 (or 33535646878 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 39.

Adding to 123243502221525 its reverse (525122205342321), we get a palindrome (648365707563846).

The spelling of 123243502221525 in words is "one hundred twenty-three trillion, two hundred forty-three billion, five hundred two million, two hundred twenty-one thousand, five hundred twenty-five".