165561154 has 24 divisors (see below), whose sum is σ = 277071984. Its totient is φ = 74124600.

The previous prime is 165561131. The next prime is 165561233. The reversal of 165561154 is 451165561.

It is an unprimeable number.

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, 11109 + ... + 21319.

It is an arithmetic number, because the mean of its divisors is an integer number (11544666).

Almost surely, 2^165561154 is an apocalyptic number.

165561154 is a deficient number, since it is larger than the sum of its proper divisors (111510830).

165561154 is a wasteful number, since it uses less digits than its factorization.

165561154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10302 (or 10291 counting only the distinct ones).

The product of its digits is 18000, while the sum is 34.

The square root of 165561154 is about 12867.0569284510. The cubic root of 165561154 is about 549.1017337400.

The spelling of 165561154 in words is "one hundred sixty-five million, five hundred sixty-one thousand, one hundred fifty-four".