165666341 has 2 divisors, whose sum is σ = 165666342. Its totient is φ = 165666340.

The previous prime is 165666331. The next prime is 165666349. The reversal of 165666341 is 143666561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134908225 + 30758116 = 11615^2 + 5546^2 .

It is a cyclic number.

It is not a de Polignac number, because 165666341 - 2²² = 161472037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165666295 and 165666304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165666349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82833170 + 82833171.

It is an arithmetic number, because the mean of its divisors is an integer number (82833171).

Almost surely, 2^165666341 is an apocalyptic number.

It is an amenable number.

165666341 is a deficient number, since it is larger than the sum of its proper divisors (1).

165666341 is an equidigital number, since it uses as much as digits as its factorization.

165666341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 165666341 is about 12871.1437331731. The cubic root of 165666341 is about 549.2179971971.

The spelling of 165666341 in words is "one hundred sixty-five million, six hundred sixty-six thousand, three hundred forty-one".