12169912525 has 12 divisors (see below), whose sum is σ = 15102812500. Its totient is φ = 9728110080.

The previous prime is 12169912507. The next prime is 12169912529. The reversal of 12169912525 is 52521996121.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 277355716 + 11892556809 = 16654^2 + 109053^2 .

It is not a de Polignac number, because 12169912525 - 2⁵ = 12169912493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12169912529) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163650 + ... + 226099.

Almost surely, 2^12169912525 is an apocalyptic number.

It is an amenable number.

12169912525 is a deficient number, since it is larger than the sum of its proper divisors (2932899975).

12169912525 is a wasteful number, since it uses less digits than its factorization.

12169912525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391008 (or 391003 counting only the distinct ones).

The product of its digits is 97200, while the sum is 43.

The spelling of 12169912525 in words is "twelve billion, one hundred sixty-nine million, nine hundred twelve thousand, five hundred twenty-five".