165606611 has 4 divisors (see below), whose sum is σ = 165632712. Its totient is φ = 165580512.

The previous prime is 165606599. The next prime is 165606653. The reversal of 165606611 is 116606561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 165606611 - 2²⁶ = 98497747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165606691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3275 + ... + 18491.

It is an arithmetic number, because the mean of its divisors is an integer number (41408178).

Almost surely, 2^165606611 is an apocalyptic number.

165606611 is a deficient number, since it is larger than the sum of its proper divisors (26101).

165606611 is a wasteful number, since it uses less digits than its factorization.

165606611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26100.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 165606611 is about 12868.8232173731. The cubic root of 165606611 is about 549.1519835175.

Subtracting from 165606611 its reverse (116606561), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 165606611 in words is "one hundred sixty-five million, six hundred six thousand, six hundred eleven".