12561065583 has 32 divisors (see below), whose sum is σ = 18829020672. Its totient is φ = 7381526400.

The previous prime is 12561065563. The next prime is 12561065591. The reversal of 12561065583 is 38556016521.

It is a happy number.

It is not a de Polignac number, because 12561065583 - 2⁹ = 12561065071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12561065533) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 340198 + ... + 375308.

It is an arithmetic number, because the mean of its divisors is an integer number (588406896).

Almost surely, 2^12561065583 is an apocalyptic number.

12561065583 is a deficient number, since it is larger than the sum of its proper divisors (6267955089).

12561065583 is a wasteful number, since it uses less digits than its factorization.

12561065583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35455.

The product of its (nonzero) digits is 216000, while the sum is 42.

The spelling of 12561065583 in words is "twelve billion, five hundred sixty-one million, sixty-five thousand, five hundred eighty-three".