165566601 has 12 divisors (see below), whose sum is σ = 245615812. Its totient is φ = 107394336.

The previous prime is 165566591. The next prime is 165566623. The reversal of 165566601 is 106665561.

165566601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 103550976 + 62015625 = 10176^2 + 7875^2 .

It is not a de Polignac number, because 165566601 - 2⁷ = 165566473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165566201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 248266 + ... + 248931.

Almost surely, 2^165566601 is an apocalyptic number.

It is an amenable number.

165566601 is a deficient number, since it is larger than the sum of its proper divisors (80049211).

165566601 is a wasteful number, since it uses less digits than its factorization.

165566601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497240 (or 497237 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 165566601 is about 12867.2685912745. The cubic root of 165566601 is about 549.1077555317.

The spelling of 165566601 in words is "one hundred sixty-five million, five hundred sixty-six thousand, six hundred one".