1659785083321 has 8 divisors (see below), whose sum is σ = 1664139558888. Its totient is φ = 1655431680000.

The previous prime is 1659785083309. The next prime is 1659785083337. The reversal of 1659785083321 is 1233805879561.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 702252380025 + 957532703296 = 838005^2 + 978536^2 .

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 1659785083321 - 2⁵ = 1659785083289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1659785083361) 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, 2880301 + ... + 3408181.

It is an arithmetic number, because the mean of its divisors is an integer number (208017444861).

Almost surely, 2^{1659785083321} is an apocalyptic number.

It is an amenable number.

1659785083321 is a deficient number, since it is larger than the sum of its proper divisors (4354475567).

1659785083321 is an equidigital number, since it uses as much as digits as its factorization.

1659785083321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536123.

The product of its (nonzero) digits is 10886400, while the sum is 58.

The spelling of 1659785083321 in words is "one trillion, six hundred fifty-nine billion, seven hundred eighty-five million, eighty-three thousand, three hundred twenty-one".