165656365 has 16 divisors (see below), whose sum is σ = 231039360. Its totient is φ = 111666240.

The previous prime is 165656357. The next prime is 165656369. The reversal of 165656365 is 563656561.

It is not a de Polignac number, because 165656365 - 2³ = 165656357 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165656369) 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 15 ways as a sum of consecutive naturals, for example, 38046 + ... + 42175.

It is an arithmetic number, because the mean of its divisors is an integer number (14439960).

Almost surely, 2^165656365 is an apocalyptic number.

It is an amenable number.

165656365 is a deficient number, since it is larger than the sum of its proper divisors (65382995).

165656365 is an equidigital number, since it uses as much as digits as its factorization.

165656365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80292.

The product of its digits is 486000, while the sum is 43.

The square root of 165656365 is about 12870.7561937906. The cubic root of 165656365 is about 549.2069728118.

The spelling of 165656365 in words is "one hundred sixty-five million, six hundred fifty-six thousand, three hundred sixty-five".