16720280719 has 4 divisors (see below), whose sum is σ = 16720648560. Its totient is φ = 16719912880.

The previous prime is 16720280713. The next prime is 16720280771. The reversal of 16720280719 is 91708202761.

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 16720280719 - 2²¹ = 16718183567 is a prime.

It is a super-2 number, since 2×16720280719² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720280713) 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, 104227 + ... + 210484.

It is an arithmetic number, because the mean of its divisors is an integer number (4180162140).

Almost surely, 2^16720280719 is an apocalyptic number.

16720280719 is a deficient number, since it is larger than the sum of its proper divisors (367841).

16720280719 is an equidigital number, since it uses as much as digits as its factorization.

16720280719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367840.

The product of its (nonzero) digits is 84672, while the sum is 43.

The spelling of 16720280719 in words is "sixteen billion, seven hundred twenty million, two hundred eighty thousand, seven hundred nineteen".