165634361 has 2 divisors, whose sum is σ = 165634362. Its totient is φ = 165634360.

The previous prime is 165634351. The next prime is 165634363. The reversal of 165634361 is 163436561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 143544361 + 22090000 = 11981^2 + 4700^2 .

It is a cyclic number.

It is not a de Polignac number, because 165634361 - 2¹⁸ = 165372217 is a prime.

Together with 165634363, it forms a pair of twin primes.

It is a Chen prime.

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

It is not a weakly prime, because it can be changed into another prime (165634363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82817180 + 82817181.

It is an arithmetic number, because the mean of its divisors is an integer number (82817181).

Almost surely, 2^165634361 is an apocalyptic number.

It is an amenable number.

165634361 is a deficient number, since it is larger than the sum of its proper divisors (1).

165634361 is an equidigital number, since it uses as much as digits as its factorization.

165634361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 35.

The square root of 165634361 is about 12869.9013593733. The cubic root of 165634361 is about 549.1826548302.

The spelling of 165634361 in words is "one hundred sixty-five million, six hundred thirty-four thousand, three hundred sixty-one".