12605345505 has 12 divisors (see below), whose sum is σ = 21849265620. Its totient is φ = 6722850912.

The previous prime is 12605345461. The next prime is 12605345513. The reversal of 12605345505 is 50554350621.

12605345505 is a `hidden beast` number, since 1 + 2 + 60 + 53 + 45 + 505 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9936899856 + 2668445649 = 99684^2 + 51657^2 .

It is not a de Polignac number, because 12605345505 - 2⁹ = 12605344993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12605345505.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 140059350 + ... + 140059439.

It is an arithmetic number, because the mean of its divisors is an integer number (1820772135).

Almost surely, 2^12605345505 is an apocalyptic number.

12605345505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12605345505 is a deficient number, since it is larger than the sum of its proper divisors (9243920115).

12605345505 is a wasteful number, since it uses less digits than its factorization.

12605345505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280118800 (or 280118797 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The spelling of 12605345505 in words is "twelve billion, six hundred five million, three hundred forty-five thousand, five hundred five".