16405503420 has 144 divisors (see below), whose sum is σ = 47592155520. Its totient is φ = 4220354688.

The previous prime is 16405503407. The next prime is 16405503451. The reversal of 16405503420 is 2430550461.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 62378209 + ... + 62378471.

It is an arithmetic number, because the mean of its divisors is an integer number (330501080).

Almost surely, 2^16405503420 is an apocalyptic number.

16405503420 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 16405503420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23796077760).

16405503420 is an abundant number, since it is smaller than the sum of its proper divisors (31186652100).

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

16405503420 is a wasteful number, since it uses less digits than its factorization.

16405503420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The spelling of 16405503420 in words is "sixteen billion, four hundred five million, five hundred three thousand, four hundred twenty".