165665151 has 12 divisors (see below), whose sum is σ = 240053112. Its totient is φ = 110093136.

The previous prime is 165665131. The next prime is 165665167. The reversal of 165665151 is 151566561.

It is not a de Polignac number, because 165665151 - 2¹⁰ = 165664127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165665131) 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, 26181 + ... + 31886.

It is an arithmetic number, because the mean of its divisors is an integer number (20004426).

Almost surely, 2^165665151 is an apocalyptic number.

165665151 is a deficient number, since it is larger than the sum of its proper divisors (74387961).

165665151 is a wasteful number, since it uses less digits than its factorization.

165665151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58390 (or 58387 counting only the distinct ones).

The product of its digits is 27000, while the sum is 36.

The square root of 165665151 is about 12871.0975056520. The cubic root of 165665151 is about 549.2166821624.

The spelling of 165665151 in words is "one hundred sixty-five million, six hundred sixty-five thousand, one hundred fifty-one".