165316420 has 12 divisors (see below), whose sum is σ = 347164524. Its totient is φ = 66126560.

The previous prime is 165316409. The next prime is 165316429. The reversal of 165316420 is 24613561.

It can be written as a sum of positive squares in 2 ways, for example, as 131606784 + 33709636 = 11472^2 + 5806^2 .

It is not an unprimeable number, because it can be changed into a prime (165316429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4132891 + ... + 4132930.

It is an arithmetic number, because the mean of its divisors is an integer number (28930377).

Almost surely, 2^165316420 is an apocalyptic number.

165316420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165316420 is an abundant number, since it is smaller than the sum of its proper divisors (181848104).

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

165316420 is a wasteful number, since it uses less digits than its factorization.

165316420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8265830 (or 8265828 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 165316420 is about 12857.5433112240. The cubic root of 165316420 is about 548.8310379262.

Adding to 165316420 its reverse (24613561), we get a palindrome (189929981).

The spelling of 165316420 in words is "one hundred sixty-five million, three hundred sixteen thousand, four hundred twenty".