16720447220458 has 4 divisors (see below), whose sum is σ = 25080670830690. Its totient is φ = 8360223610228.

The previous prime is 16720447220453. The next prime is 16720447220483. The reversal of 16720447220458 is 85402274402761.

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

It can be written as a sum of positive squares in only one way, i.e., 16720436217969 + 11002489 = 4089063^2 + 3317^2 .

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 as a sum of consecutive naturals, namely, 4180111805113 + ... + 4180111805116.

Almost surely, 2^{16720447220458} is an apocalyptic number.

16720447220458 is a deficient number, since it is larger than the sum of its proper divisors (8360223610232).

16720447220458 is an equidigital number, since it uses as much as digits as its factorization.

16720447220458 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8360223610231.

The product of its (nonzero) digits is 6021120, while the sum is 52.

The spelling of 16720447220458 in words is "sixteen trillion, seven hundred twenty billion, four hundred forty-seven million, two hundred twenty thousand, four hundred fifty-eight".