165783161 has 2 divisors, whose sum is σ = 165783162. Its totient is φ = 165783160.

The previous prime is 165783157. The next prime is 165783179. The reversal of 165783161 is 161387561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117397225 + 48385936 = 10835^2 + 6956^2 .

It is an emirp because it is prime and its reverse (161387561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165783161 - 2² = 165783157 is a prime.

It is not a weakly prime, because it can be changed into another prime (165783061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82891580 + 82891581.

It is an arithmetic number, because the mean of its divisors is an integer number (82891581).

Almost surely, 2^165783161 is an apocalyptic number.

It is an amenable number.

165783161 is a deficient number, since it is larger than the sum of its proper divisors (1).

165783161 is an equidigital number, since it uses as much as digits as its factorization.

165783161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 38.

The square root of 165783161 is about 12875.6809916990. The cubic root of 165783161 is about 549.3470609751.

The spelling of 165783161 in words is "one hundred sixty-five million, seven hundred eighty-three thousand, one hundred sixty-one".