12605640129 has 12 divisors (see below), whose sum is σ = 18210545236. Its totient is φ = 8402653152.

The previous prime is 12605640109. The next prime is 12605640133. The reversal of 12605640129 is 92104650621.

12605640129 is a `hidden beast` number, since 1 + 2 + 6 + 0 + 5 + 640 + 1 + 2 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2650190400 + 9955449729 = 51480^2 + 99777^2 .

It is not a de Polignac number, because 12605640129 - 2¹⁷ = 12605509057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12605640093 and 12605640102.

It is not an unprimeable number, because it can be changed into a prime (12605640109) 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, 16882 + ... + 159675.

Almost surely, 2^12605640129 is an apocalyptic number.

It is an amenable number.

12605640129 is a deficient number, since it is larger than the sum of its proper divisors (5604905107).

12605640129 is a wasteful number, since it uses less digits than its factorization.

12605640129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184496 (or 184493 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 12605640129 in words is "twelve billion, six hundred five million, six hundred forty thousand, one hundred twenty-nine".