165821046 has 32 divisors (see below), whose sum is σ = 345523200. Its totient is φ = 52993440.

The previous prime is 165821021. The next prime is 165821063. The reversal of 165821046 is 640128561.

It is a junction number, because it is equal to n+sod(n) for n = 165820998 and 165821016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16185 + ... + 24363.

It is an arithmetic number, because the mean of its divisors is an integer number (10797600).

Almost surely, 2^165821046 is an apocalyptic number.

165821046 is an abundant number, since it is smaller than the sum of its proper divisors (179702154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165821046 is a wasteful number, since it uses less digits than its factorization.

165821046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8324.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 165821046 is about 12877.1520919806. The cubic root of 165821046 is about 549.3889036411.

The spelling of 165821046 in words is "one hundred sixty-five million, eight hundred twenty-one thousand, forty-six".