1620782240045 has 8 divisors (see below), whose sum is σ = 1966791932280. Its totient is φ = 1282056962560.

The previous prime is 1620782240041. The next prime is 1620782240071. The reversal of 1620782240045 is 5400422870261.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 48652448329 + 1572129791716 = 220573^2 + 1253846^2 .

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

It is not a de Polignac number, because 1620782240045 - 2² = 1620782240041 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1620782239984 and 1620782240011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620782240041) 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, 1821103196 + ... + 1821104085.

It is an arithmetic number, because the mean of its divisors is an integer number (245848991535).

Almost surely, 2^{1620782240045} is an apocalyptic number.

It is an amenable number.

1620782240045 is a deficient number, since it is larger than the sum of its proper divisors (346009692235).

1620782240045 is an equidigital number, since it uses as much as digits as its factorization.

1620782240045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3642207375.

The product of its (nonzero) digits is 215040, while the sum is 41.

The spelling of 1620782240045 in words is "one trillion, six hundred twenty billion, seven hundred eighty-two million, two hundred forty thousand, forty-five".