165538117 has 2 divisors, whose sum is σ = 165538118. Its totient is φ = 165538116.

The previous prime is 165538081. The next prime is 165538123. The reversal of 165538117 is 711835561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118396161 + 47141956 = 10881^2 + 6866^2 .

It is a cyclic number.

It is not a de Polignac number, because 165538117 - 2¹⁹ = 165013829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165538157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82769058 + 82769059.

It is an arithmetic number, because the mean of its divisors is an integer number (82769059).

Almost surely, 2^165538117 is an apocalyptic number.

It is an amenable number.

165538117 is a deficient number, since it is larger than the sum of its proper divisors (1).

165538117 is an equidigital number, since it uses as much as digits as its factorization.

165538117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 37.

The square root of 165538117 is about 12866.1617042535. The cubic root of 165538117 is about 549.0762643125.

The spelling of 165538117 in words is "one hundred sixty-five million, five hundred thirty-eight thousand, one hundred seventeen".