1601728884809 has 12 divisors (see below), whose sum is σ = 1612241972244. Its totient is φ = 1591283606784.

The previous prime is 1601728884787. The next prime is 1601728884841. The reversal of 1601728884809 is 9084888271061.

It can be written as a sum of positive squares in 2 ways, for example, as 1396001325625 + 205727559184 = 1181525^2 + 453572^2 .

It is not a de Polignac number, because 1601728884809 - 2⁴⁰ = 502217257033 is a prime.

It is a hoax number, since the sum of its digits (62) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1601728884409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55568369 + ... + 55597185.

It is an arithmetic number, because the mean of its divisors is an integer number (134353497687).

Almost surely, 2^{1601728884809} is an apocalyptic number.

It is an amenable number.

1601728884809 is a deficient number, since it is larger than the sum of its proper divisors (10513087435).

1601728884809 is an equidigital number, since it uses as much as digits as its factorization.

1601728884809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31144 (or 30977 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 62.

The spelling of 1601728884809 in words is "one trillion, six hundred one billion, seven hundred twenty-eight million, eight hundred eighty-four thousand, eight hundred nine".