165680113 has 4 divisors (see below), whose sum is σ = 175426020. Its totient is φ = 155934208.

The previous prime is 165680107. The next prime is 165680149. The reversal of 165680113 is 311086561.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70090384 + 95589729 = 8372^2 + 9777^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165680113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165680153) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4872928 + ... + 4872961.

It is an arithmetic number, because the mean of its divisors is an integer number (43856505).

Almost surely, 2^165680113 is an apocalyptic number.

It is an amenable number.

165680113 is a deficient number, since it is larger than the sum of its proper divisors (9745907).

165680113 is an equidigital number, since it uses as much as digits as its factorization.

165680113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9745906.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 165680113 is about 12871.6787172459. The cubic root of 165680113 is about 549.2332157797.

The spelling of 165680113 in words is "one hundred sixty-five million, six hundred eighty thousand, one hundred thirteen".