1320644551200 has 432 divisors, whose sum is σ = 4928640859296. Its totient is φ = 305957683200.

The previous prime is 1320644551189. The next prime is 1320644551201. The reversal of 1320644551200 is 21554460231.

It is a super-2 number, since 2×1320644551200² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1320644551201) by changing a digit.

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 71 ways as a sum of consecutive naturals, for example, 6799435 + ... + 6990965.

It is an arithmetic number, because the mean of its divisors is an integer number (11408890878).

Almost surely, 2^{1320644551200} is an apocalyptic number.

1320644551200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320644551200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2464320429648).

1320644551200 is an abundant number, since it is smaller than the sum of its proper divisors (3607996308096).

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

1320644551200 is a wasteful number, since it uses less digits than its factorization.

1320644551200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191597 (or 191571 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 1320644551200 in words is "one trillion, three hundred twenty billion, six hundred forty-four million, five hundred fifty-one thousand, two hundred".