12561137144786 has 16 divisors (see below), whose sum is σ = 18866888932320. Its totient is φ = 6272177406720.

The previous prime is 12561137144779. The next prime is 12561137144797. The reversal of 12561137144786 is 68744173116521.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6973001 + ... + 8587491.

It is an arithmetic number, because the mean of its divisors is an integer number (1179180558270).

Almost surely, 2^{12561137144786} is an apocalyptic number.

12561137144786 is a deficient number, since it is larger than the sum of its proper divisors (6305751787534).

12561137144786 is a wasteful number, since it uses less digits than its factorization.

12561137144786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1619689.

The product of its digits is 6773760, while the sum is 56.

The spelling of 12561137144786 in words is "twelve trillion, five hundred sixty-one billion, one hundred thirty-seven million, one hundred forty-four thousand, seven hundred eighty-six".