166505165 has 16 divisors (see below), whose sum is σ = 210532608. Its totient is φ = 126166656.

The previous prime is 166505137. The next prime is 166505197. The reversal of 166505165 is 561505661.

It is a cyclic number.

It is not a de Polignac number, because 166505165 - 2⁸ = 166504909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4817 + ... + 18873.

It is an arithmetic number, because the mean of its divisors is an integer number (13158288).

Almost surely, 2^166505165 is an apocalyptic number.

It is an amenable number.

166505165 is a deficient number, since it is larger than the sum of its proper divisors (44027443).

166505165 is a wasteful number, since it uses less digits than its factorization.

166505165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14188.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 166505165 is about 12903.6880386965. The cubic root of 166505165 is about 550.1433951179.

The spelling of 166505165 in words is "one hundred sixty-six million, five hundred five thousand, one hundred sixty-five".