165801420 has 72 divisors (see below), whose sum is σ = 506220624. Its totient is φ = 43924608.

The previous prime is 165801367. The next prime is 165801431. The reversal of 165801420 is 24108561.

165801420 is a `hidden beast` number, since 1 + 658 + 0 + 1 + 4 + 2 + 0 = 666.

It is a super-2 number, since 2×165801420² = 54980221748032800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25327 + ... + 31193.

It is an arithmetic number, because the mean of its divisors is an integer number (7030842).

Almost surely, 2^165801420 is an apocalyptic number.

165801420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165801420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253110312).

165801420 is an abundant number, since it is smaller than the sum of its proper divisors (340419204).

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

165801420 is a wasteful number, since it uses less digits than its factorization.

165801420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6039 (or 6034 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 165801420 is about 12876.3900220520. The cubic root of 165801420 is about 549.3672282018.

Adding to 165801420 its reverse (24108561), we get a palindrome (189909981).

The spelling of 165801420 in words is "one hundred sixty-five million, eight hundred one thousand, four hundred twenty".