165620424 has 64 divisors (see below), whose sum is σ = 435133440. Its totient is φ = 52430400.

The previous prime is 165620417. The next prime is 165620431. The reversal of 165620424 is 424026561.

It is an interprime number because it is at equal distance from previous prime (165620417) and next prime (165620431).

It is a junction number, because it is equal to n+sod(n) for n = 165620391 and 165620400.

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, 82359 + ... + 84345.

It is an arithmetic number, because the mean of its divisors is an integer number (6798960).

Almost surely, 2^165620424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165620424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (217566720).

165620424 is an abundant number, since it is smaller than the sum of its proper divisors (269513016).

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

165620424 is a wasteful number, since it uses less digits than its factorization.

165620424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170 (or 2166 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 165620424 is about 12869.3598908415. The cubic root of 165620424 is about 549.1672510752.

Adding to 165620424 its reverse (424026561), we get a palindrome (589646985).

The spelling of 165620424 in words is "one hundred sixty-five million, six hundred twenty thousand, four hundred twenty-four".