165645153 has 6 divisors (see below), whose sum is σ = 239265234. Its totient is φ = 110430096.

The previous prime is 165645133. The next prime is 165645157. The reversal of 165645153 is 351546561.

165645153 is a `hidden beast` number, since 1 + 6 + 5 + 645 + 1 + 5 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 123810129 + 41835024 = 11127^2 + 6468^2 .

It is not a de Polignac number, because 165645153 - 2¹² = 165641057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165645157) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9202500 + ... + 9202517.

It is an arithmetic number, because the mean of its divisors is an integer number (39877539).

Almost surely, 2^165645153 is an apocalyptic number.

It is an amenable number.

165645153 is a deficient number, since it is larger than the sum of its proper divisors (73620081).

165645153 is a wasteful number, since it uses less digits than its factorization.

165645153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18405023 (or 18405020 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 165645153 is about 12870.3206253768. The cubic root of 165645153 is about 549.1945820061.

The spelling of 165645153 in words is "one hundred sixty-five million, six hundred forty-five thousand, one hundred fifty-three".