165171355 has 12 divisors (see below), whose sum is σ = 199512432. Its totient is φ = 131271440.

The previous prime is 165171343. The next prime is 165171359. The reversal of 165171355 is 553171561.

It is not a de Polignac number, because 165171355 - 2¹¹ = 165169307 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165171355.

It is not an unprimeable number, because it can be changed into a prime (165171359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159690 + ... + 160720.

It is an arithmetic number, because the mean of its divisors is an integer number (16626036).

Almost surely, 2^165171355 is an apocalyptic number.

165171355 is a deficient number, since it is larger than the sum of its proper divisors (34341077).

165171355 is an equidigital number, since it uses as much as digits as its factorization.

165171355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394 (or 1215 counting only the distinct ones).

The product of its digits is 15750, while the sum is 34.

The square root of 165171355 is about 12851.9008321726. The cubic root of 165171355 is about 548.6704580443.

The spelling of 165171355 in words is "one hundred sixty-five million, one hundred seventy-one thousand, three hundred fifty-five".