12505505906 has 16 divisors (see below), whose sum is σ = 19101443328. Its totient is φ = 6139089600.

The previous prime is 12505505891. The next prime is 12505505941. The reversal of 12505505906 is 60950550521.

It is a self number, because there is not a number n which added to its sum of digits gives 12505505906.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148490 + ... + 216933.

It is an arithmetic number, because the mean of its divisors is an integer number (1193840208).

Almost surely, 2^12505505906 is an apocalyptic number.

12505505906 is a deficient number, since it is larger than the sum of its proper divisors (6595937422).

12505505906 is a wasteful number, since it uses less digits than its factorization.

12505505906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365737.

The product of its (nonzero) digits is 67500, while the sum is 38.

The spelling of 12505505906 in words is "twelve billion, five hundred five million, five hundred five thousand, nine hundred six".