1605132211601 has 4 divisors (see below), whose sum is σ = 1639283960832. Its totient is φ = 1570980462372.

The previous prime is 1605132211583. The next prime is 1605132211763. The reversal of 1605132211601 is 1061122315061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605132211601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1605132214601) 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 3 ways as a sum of consecutive naturals, for example, 17075874545 + ... + 17075874638.

It is an arithmetic number, because the mean of its divisors is an integer number (409820990208).

Almost surely, 2^{1605132211601} is an apocalyptic number.

It is an amenable number.

1605132211601 is a deficient number, since it is larger than the sum of its proper divisors (34151749231).

1605132211601 is an equidigital number, since it uses as much as digits as its factorization.

1605132211601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34151749230.

The product of its (nonzero) digits is 2160, while the sum is 29.

Adding to 1605132211601 its reverse (1061122315061), we get a palindrome (2666254526662).

The spelling of 1605132211601 in words is "one trillion, six hundred five billion, one hundred thirty-two million, two hundred eleven thousand, six hundred one".