1320539051520 has 640 divisors, whose sum is σ = 5214546247680. Its totient is φ = 314563461120.

The previous prime is 1320539051497. The next prime is 1320539051521. The reversal of 1320539051520 is 251509350231.

1320539051520 is a `hidden beast` number, since 1 + 3 + 2 + 0 + 53 + 90 + 515 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320539051521) 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 63 ways as a sum of consecutive naturals, for example, 27831657 + ... + 27879063.

It is an arithmetic number, because the mean of its divisors is an integer number (8147728512).

Almost surely, 2^{1320539051520} is an apocalyptic number.

1320539051520 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 1320539051520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2607273123840).

1320539051520 is an abundant number, since it is smaller than the sum of its proper divisors (3894007196160).

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

1320539051520 is a wasteful number, since it uses less digits than its factorization.

1320539051520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47483 (or 47461 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 36.

The spelling of 1320539051520 in words is "one trillion, three hundred twenty billion, five hundred thirty-nine million, fifty-one thousand, five hundred twenty".