1326664013 has 4 divisors (see below), whose sum is σ = 1327165980. Its totient is φ = 1326162048.

The previous prime is 1326664007. The next prime is 1326664033. The reversal of 1326664013 is 3104666231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3104666231 = 2671 ⋅1162361.

It can be written as a sum of positive squares in 2 ways, for example, as 766016329 + 560647684 = 27677^2 + 23678^2 .

It is a cyclic number.

It is not a de Polignac number, because 1326664013 - 2⁸ = 1326663757 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 (1326664033) 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, 246998 + ... + 252311.

It is an arithmetic number, because the mean of its divisors is an integer number (331791495).

Almost surely, 2^1326664013 is an apocalyptic number.

It is an amenable number.

1326664013 is a deficient number, since it is larger than the sum of its proper divisors (501967).

1326664013 is an equidigital number, since it uses as much as digits as its factorization.

1326664013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501966.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 1326664013 is about 36423.3992510309. The cubic root of 1326664013 is about 1098.8042137808.

The spelling of 1326664013 in words is "one billion, three hundred twenty-six million, six hundred sixty-four thousand, thirteen".