12461578405 has 4 divisors (see below), whose sum is σ = 14953894092. Its totient is φ = 9969262720.

The previous prime is 12461578399. The next prime is 12461578439. The reversal of 12461578405 is 50487516421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1544254209 + 10917324196 = 39297^2 + 104486^2 .

It is not a de Polignac number, because 12461578405 - 2⁹ = 12461577893 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 3 ways as a sum of consecutive naturals, for example, 1246157836 + ... + 1246157845.

It is an arithmetic number, because the mean of its divisors is an integer number (3738473523).

Almost surely, 2^12461578405 is an apocalyptic number.

It is an amenable number.

12461578405 is a deficient number, since it is larger than the sum of its proper divisors (2492315687).

12461578405 is an equidigital number, since it uses as much as digits as its factorization.

12461578405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2492315686.

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 12461578405 in words is "twelve billion, four hundred sixty-one million, five hundred seventy-eight thousand, four hundred five".