1605543206601 has 16 divisors (see below), whose sum is σ = 2210604989120. Its totient is φ = 1035878518080.

The previous prime is 1605543206581. The next prime is 1605543206609. The reversal of 1605543206601 is 1066023455061.

It is not a de Polignac number, because 1605543206601 - 2⁷ = 1605543206473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1605543206601.

It is not an unprimeable number, because it can be changed into a prime (1605543206609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57078010 + ... + 57106131.

It is an arithmetic number, because the mean of its divisors is an integer number (138162811820).

Almost surely, 2^{1605543206601} is an apocalyptic number.

It is an amenable number.

1605543206601 is a deficient number, since it is larger than the sum of its proper divisors (605061782519).

1605543206601 is a wasteful number, since it uses less digits than its factorization.

1605543206601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114184296.

The product of its (nonzero) digits is 129600, while the sum is 39.

The spelling of 1605543206601 in words is "one trillion, six hundred five billion, five hundred forty-three million, two hundred six thousand, six hundred one".