16355866705920 has 1584 divisors, whose sum is σ = 68922531726048. Its totient is φ = 3709945774080.

The previous prime is 16355866705883. The next prime is 16355866705949. The reversal of 16355866705920 is 2950766855361.

It is a happy number.

16355866705920 is a `hidden beast` number, since 1 + 6 + 3 + 558 + 6 + 6 + 7 + 0 + 59 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 124853944255 + ... + 124853944385.

It is an arithmetic number, because the mean of its divisors is an integer number (43511699322).

Almost surely, 2^{16355866705920} is an apocalyptic number.

16355866705920 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 16355866705920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34461265863024).

16355866705920 is an abundant number, since it is smaller than the sum of its proper divisors (52566665020128).

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

16355866705920 is an frugal number, since it uses more digits than its factorization.

16355866705920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 81648000, while the sum is 63.

The spelling of 16355866705920 in words is "sixteen trillion, three hundred fifty-five billion, eight hundred sixty-six million, seven hundred five thousand, nine hundred twenty".