165606601 has 4 divisors (see below), whose sum is σ = 172806912. Its totient is φ = 158406292.

The previous prime is 165606599. The next prime is 165606653. The reversal of 165606601 is 106606561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 106606561 = 107 ⋅996323.

It is a cyclic number.

It is not a de Polignac number, because 165606601 - 2¹ = 165606599 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3600121 + ... + 3600166.

It is an arithmetic number, because the mean of its divisors is an integer number (43201728).

Almost surely, 2^165606601 is an apocalyptic number.

It is an amenable number.

165606601 is a deficient number, since it is larger than the sum of its proper divisors (7200311).

165606601 is an equidigital number, since it uses as much as digits as its factorization.

165606601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7200310.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 165606601 is about 12868.8228288371. The cubic root of 165606601 is about 549.1519724641.

The spelling of 165606601 in words is "one hundred sixty-five million, six hundred six thousand, six hundred one".