1601766009809 has 12 divisors (see below), whose sum is σ = 1863302300964. Its totient is φ = 1372924998144.

The previous prime is 1601766009793. The next prime is 1601766009817. The reversal of 1601766009809 is 9089006671061.

It can be written as a sum of positive squares in 2 ways, for example, as 653728846225 + 948037163584 = 808535^2 + 973672^2 .

It is not a de Polignac number, because 1601766009809 - 2⁴ = 1601766009793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601766009829) 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, 5109257 + ... + 5413689.

It is an arithmetic number, because the mean of its divisors is an integer number (155275191747).

Almost surely, 2^{1601766009809} is an apocalyptic number.

It is an amenable number.

1601766009809 is a deficient number, since it is larger than the sum of its proper divisors (261536291155).

1601766009809 is a wasteful number, since it uses less digits than its factorization.

1601766009809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411824 (or 411817 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 53.

The spelling of 1601766009809 in words is "one trillion, six hundred one billion, seven hundred sixty-six million, nine thousand, eight hundred nine".