12561271405 has 16 divisors (see below), whose sum is σ = 15786975744. Its totient is φ = 9576610560.

The previous prime is 12561271391. The next prime is 12561271417. The reversal of 12561271405 is 50417216521.

It is not a de Polignac number, because 12561271405 - 2¹³ = 12561263213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170364 + ... + 232693.

It is an arithmetic number, because the mean of its divisors is an integer number (986685984).

Almost surely, 2^12561271405 is an apocalyptic number.

It is an amenable number.

12561271405 is a deficient number, since it is larger than the sum of its proper divisors (3225704339).

12561271405 is a wasteful number, since it uses less digits than its factorization.

12561271405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403356.

The product of its (nonzero) digits is 16800, while the sum is 34.

Adding to 12561271405 its reverse (50417216521), we get a palindrome (62978487926).

The spelling of 12561271405 in words is "twelve billion, five hundred sixty-one million, two hundred seventy-one thousand, four hundred five".