12561182457 has 8 divisors (see below), whose sum is σ = 16749591360. Its totient is φ = 8373447600.

The previous prime is 12561182407. The next prime is 12561182461. The reversal of 12561182457 is 75428116521.

It is a happy number.

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

It is not a de Polignac number, because 12561182457 - 2²⁴ = 12544405241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12561182407) 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, 123294 + ... + 200807.

It is an arithmetic number, because the mean of its divisors is an integer number (2093698920).

Almost surely, 2^12561182457 is an apocalyptic number.

It is an amenable number.

12561182457 is a deficient number, since it is larger than the sum of its proper divisors (4188408903).

12561182457 is a wasteful number, since it uses less digits than its factorization.

12561182457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337023.

The product of its digits is 134400, while the sum is 42.

Adding to 12561182457 its reverse (75428116521), we get a palindrome (87989298978).

The spelling of 12561182457 in words is "twelve billion, five hundred sixty-one million, one hundred eighty-two thousand, four hundred fifty-seven".