165855755 has 12 divisors (see below), whose sum is σ = 215515440. Its totient is φ = 122477472.

The previous prime is 165855751. The next prime is 165855761. The reversal of 165855755 is 557558561.

It is not a de Polignac number, because 165855755 - 2² = 165855751 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (165855751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97295 + ... + 98984.

It is an arithmetic number, because the mean of its divisors is an integer number (17959620).

Almost surely, 2^165855755 is an apocalyptic number.

165855755 is a deficient number, since it is larger than the sum of its proper divisors (49659685).

165855755 is a wasteful number, since it uses less digits than its factorization.

165855755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196310 (or 196297 counting only the distinct ones).

The product of its digits is 1050000, while the sum is 47.

The square root of 165855755 is about 12878.4997185231. The cubic root of 165855755 is about 549.4272329316.

The spelling of 165855755 in words is "one hundred sixty-five million, eight hundred fifty-five thousand, seven hundred fifty-five".