1320731645533 has 8 divisors (see below), whose sum is σ = 1351539940608. Its totient is φ = 1289927605344.

The previous prime is 1320731645521. The next prime is 1320731645551. The reversal of 1320731645533 is 3355461370231.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1320731645533 - 2²¹ = 1320729548381 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320731645533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320731645593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431341 + ... + 1681522.

It is an arithmetic number, because the mean of its divisors is an integer number (168942492576).

Almost surely, 2^{1320731645533} is an apocalyptic number.

It is an amenable number.

1320731645533 is a deficient number, since it is larger than the sum of its proper divisors (30808295075).

1320731645533 is a wasteful number, since it uses less digits than its factorization.

1320731645533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127443.

The product of its (nonzero) digits is 680400, while the sum is 43.

The spelling of 1320731645533 in words is "one trillion, three hundred twenty billion, seven hundred thirty-one million, six hundred forty-five thousand, five hundred thirty-three".