2161331533605 has 8 divisors (see below), whose sum is σ = 3458130453792. Its totient is φ = 1152710151248.

The previous prime is 2161331533549. The next prime is 2161331533609. The reversal of 2161331533605 is 5063351331612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161331533605 - 2⁹ = 2161331533093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161331533609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72044384439 + ... + 72044384468.

It is an arithmetic number, because the mean of its divisors is an integer number (432266306724).

Almost surely, 2^{2161331533605} is an apocalyptic number.

It is an amenable number.

2161331533605 is a deficient number, since it is larger than the sum of its proper divisors (1296798920187).

2161331533605 is a wasteful number, since it uses less digits than its factorization.

2161331533605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144088768915.

The product of its (nonzero) digits is 145800, while the sum is 39.

The spelling of 2161331533605 in words is "two trillion, one hundred sixty-one billion, three hundred thirty-one million, five hundred thirty-three thousand, six hundred five".