165165616611 has 24 divisors (see below), whose sum is σ = 238993419600. Its totient is φ = 109916352000.

The previous prime is 165165616541. The next prime is 165165616643. The reversal of 165165616611 is 116616561561.

165165616611 is a `hidden beast` number, since 1 + 6 + 5 + 16 + 5 + 6 + 16 + 611 = 666.

It is not a de Polignac number, because 165165616611 - 2¹⁷ = 165165485539 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165165606611) 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, 12650815 + ... + 12663863.

It is an arithmetic number, because the mean of its divisors is an integer number (9958059150).

Almost surely, 2^165165616611 is an apocalyptic number.

165165616611 is a deficient number, since it is larger than the sum of its proper divisors (73827802989).

165165616611 is a wasteful number, since it uses less digits than its factorization.

165165616611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15427 (or 15424 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The spelling of 165165616611 in words is "one hundred sixty-five billion, one hundred sixty-five million, six hundred sixteen thousand, six hundred eleven".