12646335413 has 4 divisors (see below), whose sum is σ = 12988128300. Its totient is φ = 12304542528.

The previous prime is 12646335409. The next prime is 12646335431. The reversal of 12646335413 is 31453364621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31453364621 = 7 ⋅4493337803.

It can be written as a sum of positive squares in 2 ways, for example, as 7577180209 + 5069155204 = 87047^2 + 71198^2 .

It is a cyclic number.

It is not a de Polignac number, because 12646335413 - 2² = 12646335409 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 (12646335463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170896388 + ... + 170896461.

It is an arithmetic number, because the mean of its divisors is an integer number (3247032075).

Almost surely, 2^12646335413 is an apocalyptic number.

It is an amenable number.

12646335413 is a deficient number, since it is larger than the sum of its proper divisors (341792887).

12646335413 is an equidigital number, since it uses as much as digits as its factorization.

12646335413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341792886.

The product of its digits is 155520, while the sum is 38.

The spelling of 12646335413 in words is "twelve billion, six hundred forty-six million, three hundred thirty-five thousand, four hundred thirteen".