165809766 has 16 divisors (see below), whose sum is σ = 331745904. Its totient is φ = 55248864.

The previous prime is 165809753. The next prime is 165809771. The reversal of 165809766 is 667908561.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27060 + ... + 32616.

It is an arithmetic number, because the mean of its divisors is an integer number (20734119).

Almost surely, 2^165809766 is an apocalyptic number.

165809766 is an abundant number, since it is smaller than the sum of its proper divisors (165936138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165809766 is a wasteful number, since it uses less digits than its factorization.

165809766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10535.

The product of its (nonzero) digits is 544320, while the sum is 48.

The square root of 165809766 is about 12876.7140994898. The cubic root of 165809766 is about 549.3764459394.

The spelling of 165809766 in words is "one hundred sixty-five million, eight hundred nine thousand, seven hundred sixty-six".