1320566353920 has 2184 divisors, whose sum is σ = 5658289460208. Its totient is φ = 294298583040.

The previous prime is 1320566353853. The next prime is 1320566353921. The reversal of 1320566353920 is 293536650231.

It is a happy number.

1320566353920 is a `hidden beast` number, since 1 + 3 + 2 + 0 + 5 + 6 + 635 + 3 + 9 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320566353921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 30710845419 + ... + 30710845461.

Almost surely, 2^{1320566353920} is an apocalyptic number.

1320566353920 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 1320566353920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2829144730104).

1320566353920 is an abundant number, since it is smaller than the sum of its proper divisors (4337723106288).

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

1320566353920 is an equidigital number, since it uses as much as digits as its factorization.

1320566353920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 45.

The spelling of 1320566353920 in words is "one trillion, three hundred twenty billion, five hundred sixty-six million, three hundred fifty-three thousand, nine hundred twenty".