16696221382201 has 9 divisors (see below), whose sum is σ = 17113550326509. Its totient is φ = 16288833026400.

The previous prime is 16696221382111. The next prime is 16696221382237. The reversal of 16696221382201 is 10228312269661.

The square root of 16696221382201 is 4086101.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4185710901801 + 12510510480400 = 2045901^2 + 3537020^2 .

It is not a de Polignac number, because 16696221382201 - 2¹³ = 16696221374009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16696221382301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 167480311 + ... + 167579971.

Almost surely, 2^{16696221382201} is an apocalyptic number.

16696221382201 is the 4086101-st square number.

16696221382201 is the 2043051-st centered octagonal number.

It is an amenable number.

16696221382201 is a deficient number, since it is larger than the sum of its proper divisors (417328944308).

16696221382201 is an frugal number, since it uses more digits than its factorization.

16696221382201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199404 (or 99702 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 49.

Multiplying 16696221382201 by its sum of digits (49), we get a square (818114847727849 = 28602707²).

The spelling of 16696221382201 in words is "sixteen trillion, six hundred ninety-six billion, two hundred twenty-one million, three hundred eighty-two thousand, two hundred one".