165640606 has 16 divisors (see below), whose sum is σ = 251693568. Its totient is φ = 81748000.

The previous prime is 165640603. The next prime is 165640619. The reversal of 165640606 is 606046561.

165640606 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165640603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76296 + ... + 78436.

It is an arithmetic number, because the mean of its divisors is an integer number (15730848).

Almost surely, 2^165640606 is an apocalyptic number.

165640606 is a deficient number, since it is larger than the sum of its proper divisors (86052962).

165640606 is a wasteful number, since it uses less digits than its factorization.

165640606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 165640606 is about 12870.1439774386. The cubic root of 165640606 is about 549.1895567849.

The spelling of 165640606 in words is "one hundred sixty-five million, six hundred forty thousand, six hundred six".