12246564561 has 96 divisors (see below), whose sum is σ = 21452428800. Its totient is φ = 6140977920.

The previous prime is 12246564553. The next prime is 12246564581. The reversal of 12246564561 is 16546564221.

It is not a de Polignac number, because 12246564561 - 2³ = 12246564553 is a prime.

It is a super-2 number, since 2×12246564561² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12246564511) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6187270 + ... + 6189248.

It is an arithmetic number, because the mean of its divisors is an integer number (223462800).

Almost surely, 2^12246564561 is an apocalyptic number.

12246564561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12246564561 is a deficient number, since it is larger than the sum of its proper divisors (9205864239).

12246564561 is a wasteful number, since it uses less digits than its factorization.

12246564561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2139 (or 2132 counting only the distinct ones).

The product of its digits is 345600, while the sum is 42.

The spelling of 12246564561 in words is "twelve billion, two hundred forty-six million, five hundred sixty-four thousand, five hundred sixty-one".