16505231420 has 96 divisors (see below), whose sum is σ = 37120204800. Its totient is φ = 6153638400.

The previous prime is 16505231383. The next prime is 16505231441. The reversal of 16505231420 is 2413250561.

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, 2004071 + ... + 2012289.

It is an arithmetic number, because the mean of its divisors is an integer number (386668800).

Almost surely, 2^16505231420 is an apocalyptic number.

16505231420 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 16505231420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18560102400).

16505231420 is an abundant number, since it is smaller than the sum of its proper divisors (20614973380).

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

16505231420 is a wasteful number, since it uses less digits than its factorization.

16505231420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8379 (or 8377 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 16505231420 its reverse (2413250561), we get a palindrome (18918481981).

The spelling of 16505231420 in words is "sixteen billion, five hundred five million, two hundred thirty-one thousand, four hundred twenty".