12509564634 has 48 divisors (see below), whose sum is σ = 31324138560. Its totient is φ = 3533999040.

The previous prime is 12509564623. The next prime is 12509564647. The reversal of 12509564634 is 43646590521.

12509564634 is a `hidden beast` number, since 1 + 2 + 5 + 0 + 9 + 5 + 6 + 4 + 634 = 666.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12509564634.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 546552 + ... + 568979.

It is an arithmetic number, because the mean of its divisors is an integer number (652586220).

Almost surely, 2^12509564634 is an apocalyptic number.

12509564634 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

12509564634 is an abundant number, since it is smaller than the sum of its proper divisors (18814573926).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12509564634 is a wasteful number, since it uses less digits than its factorization.

12509564634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1115635 (or 1115632 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 12509564634 in words is "twelve billion, five hundred nine million, five hundred sixty-four thousand, six hundred thirty-four".