16721522017266 has 128 divisors (see below), whose sum is σ = 37360208793600. Its totient is φ = 4946846722560.

The previous prime is 16721522017253. The next prime is 16721522017397. The reversal of 16721522017266 is 66271022512761.

It is a super-2 number, since 2×16721522017266² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 535124455 + ... + 535155701.

It is an arithmetic number, because the mean of its divisors is an integer number (291876631200).

Almost surely, 2^{16721522017266} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16721522017266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18680104396800).

16721522017266 is an abundant number, since it is smaller than the sum of its proper divisors (20638686776334).

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

16721522017266 is a wasteful number, since it uses less digits than its factorization.

16721522017266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32464.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 16721522017266 in words is "sixteen trillion, seven hundred twenty-one billion, five hundred twenty-two million, seventeen thousand, two hundred sixty-six".