163646202420 has 96 divisors (see below), whose sum is σ = 509660726400. Its totient is φ = 43592769792.

The previous prime is 163646202403. The next prime is 163646202449. The reversal of 163646202420 is 24202646361.

163646202420 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 4 + 620 + 2 + 4 + 20 = 666.

It is a super-2 number, since 2×163646202420² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351376 + ... + 671384.

It is an arithmetic number, because the mean of its divisors is an integer number (5308965900).

Almost surely, 2^163646202420 is an apocalyptic number.

163646202420 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 163646202420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254830363200).

163646202420 is an abundant number, since it is smaller than the sum of its proper divisors (346014523980).

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

163646202420 is a wasteful number, since it uses less digits than its factorization.

163646202420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320974 (or 320966 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 163646202420 its reverse (24202646361), we get a palindrome (187848848781).

The spelling of 163646202420 in words is "one hundred sixty-three billion, six hundred forty-six million, two hundred two thousand, four hundred twenty".