165566742 has 64 divisors (see below), whose sum is σ = 390044160. Its totient is φ = 46323200.

The previous prime is 165566717. The next prime is 165566743. The reversal of 165566742 is 247665561.

It is a junction number, because it is equal to n+sod(n) for n = 165566694 and 165566703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165566743) 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, 42142 + ... + 45902.

It is an arithmetic number, because the mean of its divisors is an integer number (6094440).

Almost surely, 2^165566742 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165566742, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195022080).

165566742 is an abundant number, since it is smaller than the sum of its proper divisors (224477418).

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

165566742 is a wasteful number, since it uses less digits than its factorization.

165566742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3829.

The product of its digits is 302400, while the sum is 42.

The square root of 165566742 is about 12867.2740702917. The cubic root of 165566742 is about 549.1079114089.

The spelling of 165566742 in words is "one hundred sixty-five million, five hundred sixty-six thousand, seven hundred forty-two".