16221790587606 has 32 divisors (see below), whose sum is σ = 34133128269408. Its totient is φ = 5132801237760.

The previous prime is 16221790587593. The next prime is 16221790587617. The reversal of 16221790587606 is 60678509712261.

It is a happy number.

It is a super-2 number, since 2×16221790587606² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16221790587606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 891102225 + ... + 891120428.

It is an arithmetic number, because the mean of its divisors is an integer number (1066660258419).

Almost surely, 2^{16221790587606} is an apocalyptic number.

16221790587606 is an abundant number, since it is smaller than the sum of its proper divisors (17911337681802).

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

16221790587606 is a wasteful number, since it uses less digits than its factorization.

16221790587606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782222736.

The product of its (nonzero) digits is 15240960, while the sum is 60.

The spelling of 16221790587606 in words is "sixteen trillion, two hundred twenty-one billion, seven hundred ninety million, five hundred eighty-seven thousand, six hundred six".