165561153 has 16 divisors (see below), whose sum is σ = 233508480. Its totient is φ = 104125824.

The previous prime is 165561131. The next prime is 165561233. The reversal of 165561153 is 351165561.

It is not a de Polignac number, because 165561153 - 2⁶ = 165561089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165561103) 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 15 ways as a sum of consecutive naturals, for example, 11398 + ... + 21471.

It is an arithmetic number, because the mean of its divisors is an integer number (14594280).

Almost surely, 2^165561153 is an apocalyptic number.

It is an amenable number.

165561153 is a deficient number, since it is larger than the sum of its proper divisors (67947327).

165561153 is a wasteful number, since it uses less digits than its factorization.

165561153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32968.

The product of its digits is 13500, while the sum is 33.

The square root of 165561153 is about 12867.0568895921. The cubic root of 165561153 is about 549.1017326345.

The spelling of 165561153 in words is "one hundred sixty-five million, five hundred sixty-one thousand, one hundred fifty-three".