165780113 has 4 divisors (see below), whose sum is σ = 172987968. Its totient is φ = 158572260.

The previous prime is 165780103. The next prime is 165780161. The reversal of 165780113 is 311087561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 311087561 = 1709 ⋅182029.

It is a cyclic number.

It is not a de Polignac number, because 165780113 - 2⁶ = 165780049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 165780113.

It is not an unprimeable number, because it can be changed into a prime (165780103) 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, 3603893 + ... + 3603938.

It is an arithmetic number, because the mean of its divisors is an integer number (43246992).

Almost surely, 2^165780113 is an apocalyptic number.

It is an amenable number.

165780113 is a deficient number, since it is larger than the sum of its proper divisors (7207855).

165780113 is an equidigital number, since it uses as much as digits as its factorization.

165780113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7207854.

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 165780113 is about 12875.5626284835. The cubic root of 165780113 is about 549.3436942880.

The spelling of 165780113 in words is "one hundred sixty-five million, seven hundred eighty thousand, one hundred thirteen".