165523361 has 2 divisors, whose sum is σ = 165523362. Its totient is φ = 165523360.

The previous prime is 165523333. The next prime is 165523447. The reversal of 165523361 is 163325561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164968336 + 555025 = 12844^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 165523361 - 2²⁶ = 98414497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165523321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82761680 + 82761681.

It is an arithmetic number, because the mean of its divisors is an integer number (82761681).

Almost surely, 2^165523361 is an apocalyptic number.

It is an amenable number.

165523361 is a deficient number, since it is larger than the sum of its proper divisors (1).

165523361 is an equidigital number, since it uses as much as digits as its factorization.

165523361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 32.

The square root of 165523361 is about 12865.5882492795. The cubic root of 165523361 is about 549.0599490166.

The spelling of 165523361 in words is "one hundred sixty-five million, five hundred twenty-three thousand, three hundred sixty-one".