16720447220459 has 4 divisors (see below), whose sum is σ = 16812825382080. Its totient is φ = 16628069058840.

The previous prime is 16720447220453. The next prime is 16720447220483. The reversal of 16720447220459 is 95402274402761.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16720447220459 - 2¹⁶ = 16720447154923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16720447220459.

It is not an unprimeable number, because it can be changed into a prime (16720447220453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46189080539 + ... + 46189080900.

It is an arithmetic number, because the mean of its divisors is an integer number (4203206345520).

Almost surely, 2^{16720447220459} is an apocalyptic number.

16720447220459 is a deficient number, since it is larger than the sum of its proper divisors (92378161621).

16720447220459 is an equidigital number, since it uses as much as digits as its factorization.

16720447220459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92378161620.

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 16720447220459 in words is "sixteen trillion, seven hundred twenty billion, four hundred forty-seven million, two hundred twenty thousand, four hundred fifty-nine".