1601841501920 has 144 divisors (see below), whose sum is σ = 4160713241664. Its totient is φ = 582340070400.

The previous prime is 1601841501907. The next prime is 1601841501941. The reversal of 1601841501920 is 291051481061.

It is a happy number.

It is a super-3 number, since 3×1601841501920³ (a number of 38 digits) contains 333 as substring.

It is a congruent number.

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, 101845097 + ... + 101860823.

It is an arithmetic number, because the mean of its divisors is an integer number (28893841956).

Almost surely, 2^{1601841501920} is an apocalyptic number.

1601841501920 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 1601841501920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2080356620832).

1601841501920 is an abundant number, since it is smaller than the sum of its proper divisors (2558871739744).

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

1601841501920 is a wasteful number, since it uses less digits than its factorization.

1601841501920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21025 (or 21006 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 38.

Adding to 1601841501920 its reverse (291051481061), we get a palindrome (1892892982981).

The spelling of 1601841501920 in words is "one trillion, six hundred one billion, eight hundred forty-one million, five hundred one thousand, nine hundred twenty".