1326426643552 has 144 divisors (see below), whose sum is σ = 2773809722880. Its totient is φ = 624281831424.

The previous prime is 1326426643547. The next prime is 1326426643589. The reversal of 1326426643552 is 2553466246231.

It is a junction number, because it is equal to n+sod(n) for n = 1326426643496 and 1326426643505.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1809585778 + ... + 1809586510.

It is an arithmetic number, because the mean of its divisors is an integer number (19262567520).

Almost surely, 2^{1326426643552} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1326426643552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386904861440).

1326426643552 is an abundant number, since it is smaller than the sum of its proper divisors (1447383079328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1326426643552 is a wasteful number, since it uses less digits than its factorization.

1326426643552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573 (or 1546 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 49.

The spelling of 1326426643552 in words is "one trillion, three hundred twenty-six billion, four hundred twenty-six million, six hundred forty-three thousand, five hundred fifty-two".