16209720637920 has 288 divisors, whose sum is σ = 55584081221760. Its totient is φ = 4301634677760.

The previous prime is 16209720637907. The next prime is 16209720637927. The reversal of 16209720637920 is 2973602790261.

16209720637920 is a `hidden beast` number, since 1 + 62 + 0 + 9 + 7 + 206 + 379 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16209720637927) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 829938555 + ... + 829958085.

It is an arithmetic number, because the mean of its divisors is an integer number (193000282020).

Almost surely, 2^{16209720637920} is an apocalyptic number.

16209720637920 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 16209720637920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27792040610880).

16209720637920 is an abundant number, since it is smaller than the sum of its proper divisors (39374360583840).

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

16209720637920 is a wasteful number, since it uses less digits than its factorization.

16209720637920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22318 (or 22307 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 16209720637920 in words is "sixteen trillion, two hundred nine billion, seven hundred twenty million, six hundred thirty-seven thousand, nine hundred twenty".