165546906 has 64 divisors (see below), whose sum is σ = 393984000. Its totient is φ = 45372096.

The previous prime is 165546881. The next prime is 165546907. The reversal of 165546906 is 609645561.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165546907) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242041 + ... + 242723.

It is an arithmetic number, because the mean of its divisors is an integer number (6156000).

Almost surely, 2^165546906 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165546906, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196992000).

165546906 is an abundant number, since it is smaller than the sum of its proper divisors (228437094).

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

165546906 is a wasteful number, since it uses less digits than its factorization.

165546906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 165546906 is about 12866.5032545754. The cubic root of 165546906 is about 549.0859816030.

The spelling of 165546906 in words is "one hundred sixty-five million, five hundred forty-six thousand, nine hundred six".