12505402136 has 16 divisors (see below), whose sum is σ = 23509501800. Its totient is φ = 6236201664.

The previous prime is 12505402109. The next prime is 12505402153. The reversal of 12505402136 is 63120450521.

It is a junction number, because it is equal to n+sod(n) for n = 12505402099 and 12505402108.

It is a congruent 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, 2059205 + ... + 2065268.

Almost surely, 2^12505402136 is an apocalyptic number.

It is an amenable number.

12505402136 is a deficient number, since it is larger than the sum of its proper divisors (11004099664).

12505402136 is a wasteful number, since it uses less digits than its factorization.

12505402136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124858 (or 4124854 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 12505402136 its reverse (63120450521), we get a palindrome (75625852657).

The spelling of 12505402136 in words is "twelve billion, five hundred five million, four hundred two thousand, one hundred thirty-six".