165409156 has 24 divisors (see below), whose sum is σ = 326672640. Its totient is φ = 72592800.

The previous prime is 165409141. The next prime is 165409157. The reversal of 165409156 is 651904561.

165409156 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (165409157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63540 + ... + 66091.

It is an arithmetic number, because the mean of its divisors is an integer number (13611360).

Almost surely, 2^165409156 is an apocalyptic number.

It is an amenable number.

165409156 is a deficient number, since it is larger than the sum of its proper divisors (161263484).

165409156 is a wasteful number, since it uses less digits than its factorization.

165409156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129675 (or 129673 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 165409156 is about 12861.1490932964. The cubic root of 165409156 is about 548.9336429409.

The spelling of 165409156 in words is "one hundred sixty-five million, four hundred nine thousand, one hundred fifty-six".