1326961568729 has 4 divisors (see below), whose sum is σ = 1326969452160. Its totient is φ = 1326953685300.

The previous prime is 1326961568711. The next prime is 1326961568759. The reversal of 1326961568729 is 9278651696231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1326961568729 - 2²⁸ = 1326693133273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1326961568759) 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, 3683597 + ... + 4027754.

It is an arithmetic number, because the mean of its divisors is an integer number (331742363040).

Almost surely, 2^{1326961568729} is an apocalyptic number.

It is an amenable number.

1326961568729 is a deficient number, since it is larger than the sum of its proper divisors (7883431).

1326961568729 is an equidigital number, since it uses as much as digits as its factorization.

1326961568729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7883430.

The product of its digits is 58786560, while the sum is 65.

The spelling of 1326961568729 in words is "one trillion, three hundred twenty-six billion, nine hundred sixty-one million, five hundred sixty-eight thousand, seven hundred twenty-nine".