12318528525 has 48 divisors (see below), whose sum is σ = 21594849984. Its totient is φ = 6174766080.

The previous prime is 12318528517. The next prime is 12318528527. The reversal of 12318528525 is 52582581321.

It is a happy number.

It is not a de Polignac number, because 12318528525 - 2³ = 12318528517 is a prime.

It is a super-2 number, since 2×12318528525² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12318528527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 958794 + ... + 971556.

It is an arithmetic number, because the mean of its divisors is an integer number (449892708).

Almost surely, 2^12318528525 is an apocalyptic number.

12318528525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12318528525 is a deficient number, since it is larger than the sum of its proper divisors (9276321459).

12318528525 is a wasteful number, since it uses less digits than its factorization.

12318528525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13550 (or 13545 counting only the distinct ones).

The product of its digits is 192000, while the sum is 42.

The spelling of 12318528525 in words is "twelve billion, three hundred eighteen million, five hundred twenty-eight thousand, five hundred twenty-five".