165817153 has 2 divisors, whose sum is σ = 165817154. Its totient is φ = 165817152.

The previous prime is 165817117. The next prime is 165817181. The reversal of 165817153 is 351718561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162103824 + 3713329 = 12732^2 + 1927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165817153 is a prime.

It is not a weakly prime, because it can be changed into another prime (165817193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82908576 + 82908577.

It is an arithmetic number, because the mean of its divisors is an integer number (82908577).

Almost surely, 2^165817153 is an apocalyptic number.

It is an amenable number.

165817153 is a deficient number, since it is larger than the sum of its proper divisors (1).

165817153 is an equidigital number, since it uses as much as digits as its factorization.

165817153 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 165817153 is about 12877.0009318940. Note that the first 3 decimals coincide. The cubic root of 165817153 is about 549.3846042517.

The spelling of 165817153 in words is "one hundred sixty-five million, eight hundred seventeen thousand, one hundred fifty-three".