12561088509 has 24 divisors (see below), whose sum is σ = 18950997312. Its totient is φ = 8002209600.

The previous prime is 12561088489. The next prime is 12561088517. The reversal of 12561088509 is 90588016521.

It is a happy number.

12561088509 is a `hidden beast` number, since 1 + 2 + 5 + 61 + 0 + 88 + 509 = 666.

It is not a de Polignac number, because 12561088509 - 2⁷ = 12561088381 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561088609) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188689 + ... + 246425.

It is an arithmetic number, because the mean of its divisors is an integer number (789624888).

Almost surely, 2^12561088509 is an apocalyptic number.

It is an amenable number.

12561088509 is a deficient number, since it is larger than the sum of its proper divisors (6389908803).

12561088509 is a wasteful number, since it uses less digits than its factorization.

12561088509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58817 (or 58814 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 12561088509 in words is "twelve billion, five hundred sixty-one million, eighty-eight thousand, five hundred nine".