12563697561 has 8 divisors (see below), whose sum is σ = 17736984864. Its totient is φ = 7883104320.

The previous prime is 12563697557. The next prime is 12563697569. The reversal of 12563697561 is 16579636521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12563697561 - 2² = 12563697557 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 246347011 = 12563697561 / (1 + 2 + 5 + 6 + 3 + 6 + 9 + 7 + 5 + 6 + 1).

It is not an unprimeable number, because it can be changed into a prime (12563697569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123173455 + ... + 123173556.

It is an arithmetic number, because the mean of its divisors is an integer number (2217123108).

Almost surely, 2^12563697561 is an apocalyptic number.

It is an amenable number.

12563697561 is a deficient number, since it is larger than the sum of its proper divisors (5173287303).

12563697561 is a wasteful number, since it uses less digits than its factorization.

12563697561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246347031.

The product of its digits is 2041200, while the sum is 51.

The spelling of 12563697561 in words is "twelve billion, five hundred sixty-three million, six hundred ninety-seven thousand, five hundred sixty-one".