12616312405 has 4 divisors (see below), whose sum is σ = 15139574892. Its totient is φ = 10093049920.

The previous prime is 12616312393. The next prime is 12616312409. The reversal of 12616312405 is 50421361621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50421361621 = 65581 ⋅768841.

It can be written as a sum of positive squares in 2 ways, for example, as 2699737681 + 9916574724 = 51959^2 + 99582^2 .

It is not a de Polignac number, because 12616312405 - 2³¹ = 10468828757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12616312409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1261631236 + ... + 1261631245.

It is an arithmetic number, because the mean of its divisors is an integer number (3784893723).

Almost surely, 2^12616312405 is an apocalyptic number.

It is an amenable number.

12616312405 is a deficient number, since it is larger than the sum of its proper divisors (2523262487).

12616312405 is an equidigital number, since it uses as much as digits as its factorization.

12616312405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2523262486.

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 12616312405 in words is "twelve billion, six hundred sixteen million, three hundred twelve thousand, four hundred five".