12561447142 has 4 divisors (see below), whose sum is σ = 18842170716. Its totient is φ = 6280723570.

The previous prime is 12561447131. The next prime is 12561447167. The reversal of 12561447142 is 24174416521.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3140361784 + ... + 3140361787.

It is an arithmetic number, because the mean of its divisors is an integer number (4710542679).

Almost surely, 2^12561447142 is an apocalyptic number.

12561447142 is a deficient number, since it is larger than the sum of its proper divisors (6280723574).

12561447142 is an equidigital number, since it uses as much as digits as its factorization.

12561447142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6280723573.

The product of its digits is 53760, while the sum is 37.

The spelling of 12561447142 in words is "twelve billion, five hundred sixty-one million, four hundred forty-seven thousand, one hundred forty-two".