12405544405 has 4 divisors (see below), whose sum is σ = 14886653292. Its totient is φ = 9924435520.

The previous prime is 12405544387. The next prime is 12405544423. The reversal of 12405544405 is 50444550421.

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

It is an interprime number because it is at equal distance from previous prime (12405544387) and next prime (12405544423).

It can be written as a sum of positive squares in 2 ways, for example, as 4811641956 + 7593902449 = 69366^2 + 87143^2 .

It is not a de Polignac number, because 12405544405 - 2¹⁷ = 12405413333 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, 1240554436 + ... + 1240554445.

It is an arithmetic number, because the mean of its divisors is an integer number (3721663323).

Almost surely, 2^12405544405 is an apocalyptic number.

It is an amenable number.

12405544405 is a deficient number, since it is larger than the sum of its proper divisors (2481108887).

12405544405 is an equidigital number, since it uses as much as digits as its factorization.

12405544405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481108886.

The product of its (nonzero) digits is 64000, while the sum is 34.

The spelling of 12405544405 in words is "twelve billion, four hundred five million, five hundred forty-four thousand, four hundred five".