1660115601009 has 24 divisors (see below), whose sum is σ = 2433902725800. Its totient is φ = 1090240208640.

The previous prime is 1660115600999. The next prime is 1660115601049. The reversal of 1660115601009 is 9001065110661.

1660115601009 is a `hidden beast` number, since 16 + 60 + 11 + 560 + 10 + 0 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 89104041009 + 1571011560000 = 298503^2 + 1253400^2 .

It is not a de Polignac number, because 1660115601009 - 2⁴ = 1660115600993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1660115601049) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3636862 + ... + 4067799.

It is an arithmetic number, because the mean of its divisors is an integer number (101412613575).

Almost surely, 2^{1660115601009} is an apocalyptic number.

It is an amenable number.

1660115601009 is a deficient number, since it is larger than the sum of its proper divisors (773787124791).

1660115601009 is a wasteful number, since it uses less digits than its factorization.

1660115601009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7705025 (or 7705022 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The spelling of 1660115601009 in words is "one trillion, six hundred sixty billion, one hundred fifteen million, six hundred one thousand, nine".